diff --git a/Neos.ContentGraph.DoctrineDbalAdapter/src/Domain/Repository/ContentGraph.php b/Neos.ContentGraph.DoctrineDbalAdapter/src/Domain/Repository/ContentGraph.php
index b006fa1019d..76d17cdf6c1 100644
--- a/Neos.ContentGraph.DoctrineDbalAdapter/src/Domain/Repository/ContentGraph.php
+++ b/Neos.ContentGraph.DoctrineDbalAdapter/src/Domain/Repository/ContentGraph.php
@@ -26,6 +26,7 @@
 use Neos\ContentRepository\Core\DimensionSpace\OriginDimensionSpacePoint;
 use Neos\ContentRepository\Core\NodeType\NodeTypeManager;
 use Neos\ContentRepository\Core\NodeType\NodeTypeName;
+use Neos\ContentRepository\Core\NodeType\NodeTypeNames;
 use Neos\ContentRepository\Core\Projection\ContentGraph\ContentGraphInterface;
 use Neos\ContentRepository\Core\Projection\ContentGraph\ContentGraphWithRuntimeCaches\ContentSubgraphWithRuntimeCaches;
 use Neos\ContentRepository\Core\Projection\ContentGraph\ContentSubgraphInterface;
@@ -132,6 +133,9 @@ public function findRootNodeAggregateByType(
             foreach ($rootNodeAggregates as $rootNodeAggregate) {
                 $ids[] = $rootNodeAggregate->nodeAggregateId->value;
             }
+
+            // We throw if multiple root node aggregates of the given $nodeTypeName were found,
+            // as this would lead to nondeterministic results. Must not happen.
             throw new \RuntimeException(sprintf(
                 'More than one root node aggregate of type "%s" found (IDs: %s).',
                 $nodeTypeName->value,
@@ -151,12 +155,12 @@ public function findRootNodeAggregates(
         FindRootNodeAggregatesFilter $filter,
     ): NodeAggregates {
         $rootNodeAggregateQueryBuilder = $this->nodeQueryBuilder->buildFindRootNodeAggregatesQuery($this->contentStreamId, $filter);
-        return NodeAggregates::fromArray(iterator_to_array($this->mapQueryBuilderToNodeAggregates($rootNodeAggregateQueryBuilder)));
+        return $this->mapQueryBuilderToNodeAggregates($rootNodeAggregateQueryBuilder);
     }
 
     public function findNodeAggregatesByType(
         NodeTypeName $nodeTypeName
-    ): iterable {
+    ): NodeAggregates {
         $queryBuilder = $this->nodeQueryBuilder->buildBasicNodeAggregateQuery();
         $queryBuilder
             ->andWhere('n.nodetypename = :nodeTypeName')
@@ -190,12 +194,10 @@ public function findNodeAggregateById(
      * Parent node aggregates can have a greater dimension space coverage than the given child.
      * Thus, it is not enough to just resolve them from the nodes and edges connected to the given child node aggregate.
      * Instead, we resolve all parent node aggregate ids instead and fetch the complete aggregates from there.
-     *
-     * @return iterable<NodeAggregate>
      */
     public function findParentNodeAggregates(
         NodeAggregateId $childNodeAggregateId
-    ): iterable {
+    ): NodeAggregates {
         $queryBuilder = $this->nodeQueryBuilder->buildBasicNodeAggregateQuery()
             ->innerJoin('n', $this->nodeQueryBuilder->tableNames->hierarchyRelation(), 'ch', 'ch.parentnodeanchor = n.relationanchorpoint')
             ->innerJoin('ch', $this->nodeQueryBuilder->tableNames->node(), 'cn', 'cn.relationanchorpoint = ch.childnodeanchor')
@@ -209,12 +211,9 @@ public function findParentNodeAggregates(
         return $this->mapQueryBuilderToNodeAggregates($queryBuilder);
     }
 
-    /**
-     * @return iterable<NodeAggregate>
-     */
     public function findChildNodeAggregates(
         NodeAggregateId $parentNodeAggregateId
-    ): iterable {
+    ): NodeAggregates {
         $queryBuilder = $this->nodeQueryBuilder->buildChildNodeAggregateQuery($parentNodeAggregateId, $this->contentStreamId);
         return $this->mapQueryBuilderToNodeAggregates($queryBuilder);
     }
@@ -252,7 +251,7 @@ public function findParentNodeAggregateByChildOriginDimensionSpacePoint(NodeAggr
         );
     }
 
-    public function findTetheredChildNodeAggregates(NodeAggregateId $parentNodeAggregateId): iterable
+    public function findTetheredChildNodeAggregates(NodeAggregateId $parentNodeAggregateId): NodeAggregates
     {
         $queryBuilder = $this->nodeQueryBuilder->buildChildNodeAggregateQuery($parentNodeAggregateId, $this->contentStreamId)
             ->andWhere('cn.classification = :tetheredClassification')
@@ -319,12 +318,12 @@ public function countNodes(): int
         }
     }
 
-    public function findUsedNodeTypeNames(): iterable
+    public function findUsedNodeTypeNames(): NodeTypeNames
     {
-        return array_map(
+        return NodeTypeNames::fromArray(array_map(
             static fn (array $row) => NodeTypeName::fromString($row['nodetypename']),
             $this->fetchRows($this->nodeQueryBuilder->buildFindUsedNodeTypeNamesQuery())
-        );
+        ));
     }
 
     private function createQueryBuilder(): QueryBuilder
@@ -344,9 +343,8 @@ private function mapQueryBuilderToNodeAggregate(QueryBuilder $queryBuilder): ?No
 
     /**
      * @param QueryBuilder $queryBuilder
-     * @return iterable<NodeAggregate>
      */
-    private function mapQueryBuilderToNodeAggregates(QueryBuilder $queryBuilder): iterable
+    private function mapQueryBuilderToNodeAggregates(QueryBuilder $queryBuilder): NodeAggregates
     {
         return $this->nodeFactory->mapNodeRowsToNodeAggregates(
             $this->fetchRows($queryBuilder),
diff --git a/Neos.ContentGraph.DoctrineDbalAdapter/src/Domain/Repository/NodeFactory.php b/Neos.ContentGraph.DoctrineDbalAdapter/src/Domain/Repository/NodeFactory.php
index 02bf350f48a..4a83e209be0 100644
--- a/Neos.ContentGraph.DoctrineDbalAdapter/src/Domain/Repository/NodeFactory.php
+++ b/Neos.ContentGraph.DoctrineDbalAdapter/src/Domain/Repository/NodeFactory.php
@@ -25,6 +25,7 @@
 use Neos\ContentRepository\Core\Projection\ContentGraph\DimensionSpacePointsBySubtreeTags;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Node;
 use Neos\ContentRepository\Core\Projection\ContentGraph\NodeAggregate;
+use Neos\ContentRepository\Core\Projection\ContentGraph\NodeAggregates;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Nodes;
 use Neos\ContentRepository\Core\Projection\ContentGraph\NodeTags;
 use Neos\ContentRepository\Core\Projection\ContentGraph\OriginByCoverage;
@@ -233,16 +234,21 @@ public function mapNodeRowsToNodeAggregate(
     }
 
     /**
-     * @param iterable<int,array<string,string>> $nodeRows
-     * @return iterable<int,NodeAggregate>
+     * @param array<int,array<string,string>> $nodeRows
      * @throws NodeTypeNotFound
      */
     public function mapNodeRowsToNodeAggregates(
-        iterable $nodeRows,
+        array $nodeRows,
         WorkspaceName $workspaceName,
         ContentStreamId $contentStreamId,
         VisibilityConstraints $visibilityConstraints
-    ): iterable {
+    ): NodeAggregates {
+        if (empty($nodeRows)) {
+            return NodeAggregates::createEmpty();
+        }
+
+        $nodeAggregates = [];
+
         $nodeTypeNames = [];
         $nodeNames = [];
         $occupiedDimensionSpacePointsByNodeAggregate = [];
@@ -308,7 +314,7 @@ public function mapNodeRowsToNodeAggregates(
 
         foreach ($nodesByOccupiedDimensionSpacePointsByNodeAggregate as $rawNodeAggregateId => $nodes) {
             /** @var string $rawNodeAggregateId */
-            yield NodeAggregate::create(
+            $nodeAggregates[] = NodeAggregate::create(
                 $this->contentRepositoryId,
                 $workspaceName,
                 NodeAggregateId::fromString($rawNodeAggregateId),
@@ -334,6 +340,8 @@ public function mapNodeRowsToNodeAggregates(
                 $contentStreamId,
             );
         }
+
+        return NodeAggregates::fromArray($nodeAggregates);
     }
 
     public static function extractNodeTagsFromJson(string $subtreeTagsJson): NodeTags
diff --git a/Neos.ContentGraph.PostgreSQLAdapter/src/Domain/Repository/ContentHypergraph.php b/Neos.ContentGraph.PostgreSQLAdapter/src/Domain/Repository/ContentHypergraph.php
index 25a70995cd5..3127c86e061 100644
--- a/Neos.ContentGraph.PostgreSQLAdapter/src/Domain/Repository/ContentHypergraph.php
+++ b/Neos.ContentGraph.PostgreSQLAdapter/src/Domain/Repository/ContentHypergraph.php
@@ -23,6 +23,7 @@
 use Neos\ContentRepository\Core\DimensionSpace\OriginDimensionSpacePoint;
 use Neos\ContentRepository\Core\NodeType\NodeTypeManager;
 use Neos\ContentRepository\Core\NodeType\NodeTypeName;
+use Neos\ContentRepository\Core\NodeType\NodeTypeNames;
 use Neos\ContentRepository\Core\Projection\ContentGraph\ContentGraphInterface;
 use Neos\ContentRepository\Core\Projection\ContentGraph\ContentSubgraphInterface;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindRootNodeAggregatesFilter;
@@ -127,13 +128,10 @@ public function findRootNodeAggregates(
         throw new \BadMethodCallException('method findRootNodeAggregates is not implemented yet.', 1645782874);
     }
 
-    /**
-     * @return \Iterator<int,NodeAggregate>
-     */
     public function findNodeAggregatesByType(
         NodeTypeName $nodeTypeName
-    ): \Iterator {
-        return new \Generator();
+    ): NodeAggregates {
+        return NodeAggregates::createEmpty();
     }
 
     public function findNodeAggregateById(
@@ -188,12 +186,9 @@ public function findParentNodeAggregateByChildOriginDimensionSpacePoint(
         );
     }
 
-    /**
-     * @return iterable<NodeAggregate>
-     */
     public function findParentNodeAggregates(
         NodeAggregateId $childNodeAggregateId
-    ): iterable {
+    ): NodeAggregates {
         $query = HypergraphParentQuery::create($this->contentStreamId, $this->tableNamePrefix);
         $query = $query->withChildNodeAggregateId($childNodeAggregateId);
 
@@ -205,12 +200,9 @@ public function findParentNodeAggregates(
         );
     }
 
-    /**
-     * @return iterable<NodeAggregate>
-     */
     public function findChildNodeAggregates(
         NodeAggregateId $parentNodeAggregateId
-    ): iterable {
+    ): NodeAggregates {
         $query = HypergraphChildQuery::create(
             $this->contentStreamId,
             $parentNodeAggregateId,
@@ -244,12 +236,9 @@ public function findChildNodeAggregateByName(
         );
     }
 
-    /**
-     * @return iterable<NodeAggregate>
-     */
     public function findTetheredChildNodeAggregates(
         NodeAggregateId $parentNodeAggregateId
-    ): iterable {
+    ): NodeAggregates {
         $query = HypergraphChildQuery::create(
             $this->contentStreamId,
             $parentNodeAggregateId,
@@ -298,12 +287,9 @@ public function countNodes(): int
         return $this->dbal->executeQuery($query)->fetchOne();
     }
 
-    /**
-     * @return iterable<int,NodeTypeName>
-     */
-    public function findUsedNodeTypeNames(): iterable
+    public function findUsedNodeTypeNames(): NodeTypeNames
     {
-        return [];
+        return NodeTypeNames::createEmpty();
     }
 
     public function getContentStreamId(): ContentStreamId
diff --git a/Neos.ContentGraph.PostgreSQLAdapter/src/Domain/Repository/NodeFactory.php b/Neos.ContentGraph.PostgreSQLAdapter/src/Domain/Repository/NodeFactory.php
index df19bae4b34..4fa61afde28 100644
--- a/Neos.ContentGraph.PostgreSQLAdapter/src/Domain/Repository/NodeFactory.php
+++ b/Neos.ContentGraph.PostgreSQLAdapter/src/Domain/Repository/NodeFactory.php
@@ -25,6 +25,7 @@
 use Neos\ContentRepository\Core\Projection\ContentGraph\DimensionSpacePointsBySubtreeTags;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Node;
 use Neos\ContentRepository\Core\Projection\ContentGraph\NodeAggregate;
+use Neos\ContentRepository\Core\Projection\ContentGraph\NodeAggregates;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Nodes;
 use Neos\ContentRepository\Core\Projection\ContentGraph\NodeTags;
 use Neos\ContentRepository\Core\Projection\ContentGraph\OriginByCoverage;
@@ -252,15 +253,15 @@ public function mapNodeRowsToNodeAggregate(
 
     /**
      * @param array<int,array<string,mixed>> $nodeRows
-     * @return iterable<int,\Neos\ContentRepository\Core\Projection\ContentGraph\NodeAggregate>
      */
-    public function mapNodeRowsToNodeAggregates(array $nodeRows, VisibilityConstraints $visibilityConstraints): iterable
+    public function mapNodeRowsToNodeAggregates(array $nodeRows, VisibilityConstraints $visibilityConstraints): NodeAggregates
     {
-        $nodeAggregates = [];
         if (empty($nodeRows)) {
-            return $nodeAggregates;
+            return NodeAggregates::createEmpty();
         }
 
+        $nodeAggregates = [];
+
         $contentStreamId = null;
         /** @var NodeAggregateId[] $nodeAggregateIds */
         $nodeAggregateIds = [];
@@ -330,7 +331,7 @@ public function mapNodeRowsToNodeAggregates(array $nodeRows, VisibilityConstrain
         }
 
         foreach ($nodeAggregateIds as $key => $nodeAggregateId) {
-            yield NodeAggregate::create(
+            $nodeAggregates[] = NodeAggregate::create(
                 $this->contentRepositoryId,
                 WorkspaceName::fromString('missing'), // todo
                 $nodeAggregateId,
@@ -348,6 +349,8 @@ public function mapNodeRowsToNodeAggregates(array $nodeRows, VisibilityConstrain
                 $contentStreamId,
             );
         }
+
+        return NodeAggregates::fromArray($nodeAggregates);
     }
 
     private static function parseDateTimeString(string $string): \DateTimeImmutable
diff --git a/Neos.ContentRepository.Core/Classes/Projection/ContentGraph/ContentGraphInterface.php b/Neos.ContentRepository.Core/Classes/Projection/ContentGraph/ContentGraphInterface.php
index 6a5ef9a7948..edc925f622d 100644
--- a/Neos.ContentRepository.Core/Classes/Projection/ContentGraph/ContentGraphInterface.php
+++ b/Neos.ContentRepository.Core/Classes/Projection/ContentGraph/ContentGraphInterface.php
@@ -18,6 +18,7 @@
 use Neos\ContentRepository\Core\DimensionSpace\DimensionSpacePointSet;
 use Neos\ContentRepository\Core\DimensionSpace\OriginDimensionSpacePoint;
 use Neos\ContentRepository\Core\NodeType\NodeTypeName;
+use Neos\ContentRepository\Core\NodeType\NodeTypeNames;
 use Neos\ContentRepository\Core\Projection\ProjectionStateInterface;
 use Neos\ContentRepository\Core\SharedModel\ContentRepository\ContentRepositoryId;
 use Neos\ContentRepository\Core\SharedModel\Exception\NodeAggregatesTypeIsAmbiguous;
@@ -58,11 +59,7 @@ public function getSubgraph(
     ): ContentSubgraphInterface;
 
     /**
-     * Throws exception if no root aggregate found, because a Content Repository needs at least
-     * one root node to function.
-     *
-     * Also throws exceptions if multiple root node aggregates of the given $nodeTypeName were found,
-     * as this would lead to nondeterministic results in your code.
+     * Throws exception if no root aggregate of the given type found.
      *
      * @throws RootNodeAggregateDoesNotExist
      * @api
@@ -79,12 +76,11 @@ public function findRootNodeAggregates(
     ): NodeAggregates;
 
     /**
-     * @return iterable<NodeAggregate>
      * @api
      */
     public function findNodeAggregatesByType(
         NodeTypeName $nodeTypeName
-    ): iterable;
+    ): NodeAggregates;
 
     /**
      * @throws NodeAggregatesTypeIsAmbiguous
@@ -97,10 +93,9 @@ public function findNodeAggregateById(
     /**
      * Returns all node types in use, from the graph projection
      *
-     * @return iterable<NodeTypeName>
      * @api
      */
-    public function findUsedNodeTypeNames(): iterable;
+    public function findUsedNodeTypeNames(): NodeTypeNames;
 
     /**
      * @internal only for consumption inside the Command Handler
@@ -111,20 +106,18 @@ public function findParentNodeAggregateByChildOriginDimensionSpacePoint(
     ): ?NodeAggregate;
 
     /**
-     * @return iterable<NodeAggregate>
      * @internal only for consumption inside the Command Handler
      */
     public function findParentNodeAggregates(
         NodeAggregateId $childNodeAggregateId
-    ): iterable;
+    ): NodeAggregates;
 
     /**
-     * @return iterable<NodeAggregate>
      * @internal only for consumption inside the Command Handler
      */
     public function findChildNodeAggregates(
         NodeAggregateId $parentNodeAggregateId
-    ): iterable;
+    ): NodeAggregates;
 
     /**
      * A node aggregate can have no or exactly one child node aggregate with a given name as enforced by constraint checks
@@ -137,12 +130,11 @@ public function findChildNodeAggregateByName(
     ): ?NodeAggregate;
 
     /**
-     * @return iterable<NodeAggregate>
      * @internal only for consumption inside the Command Handler
      */
     public function findTetheredChildNodeAggregates(
         NodeAggregateId $parentNodeAggregateId
-    ): iterable;
+    ): NodeAggregates;
 
     /**
      * @internal only for consumption inside the Command Handler