imported transform hierarchy with materials different to standard?

[andypoly]

GLB format is slightly unusual in that there is a primitive per material, but I notice glTFast uses a different hierarchy to some viewers during runtime creation of a model:

Runtime load of a glb file - the resulting transform hierarchy has
root -> PrimitiveID (with material #1 mesh) -> material 2 mesh

If you load such a glb in say https://sandbox.babylonjs.com/ you have material mesh nodes alongside each other under a primitive node
root->
-PrimitiveID node ->
--material1 mesh
--material2 mesh

Is this by-design (optimal reduced transform hierarchy) or something to fix or to be fixed (still on v4 here)
Because I was going to rely on the standard hierarchy for special material transforming via the transform

[andypoly]

Well looking at GameObjectInstantiator.cs this is intended, but is an easy alteration...