[pixelesque]

glTF is really single-asset only: that's not what USD is - USD is designed for entire scenes with scene graph hierarchy, and layers of overrides / additions (it's essentially a mini-evaluation engine internally). It's very powerful, but also quite complicated, and not just a file format.

USD started in the very complicated CG/VFX world where this type of complexity and flexibility is needed, however, Apple (and others) have been pushing it into other realms (VR, mobile, .usdz).

[johnnyanmac]

GLTF supports scene graphs. But given what domain creates and primarily uses it, most of its usage in projects will inevitably treat it as if it's an FBX substitute. We're still far from the days where Unity/Unreal Engine will export an entire scene into a hierarchy of gltf files with one master file to organize them.