The solaris system is great and with the stage manager,you can even drag&drop usd files.

But...the process to convert models to usd is hard.If you import some complicated fbx models/scenes,it's very very hard to manage these elements using nodes.But if you can using a C4D/Blender like layer-based system to manage the models,it will be much easier.

Solaris/stage manager/component builder/usd,the are all great.Houdini is lacking the final step,if sidefx could expand the stage manager to a regular layer-based object manager.Then finally houdini could be a general 3D package for everything.

Just my two cents.