Thanks for doing that, model-raise!

You're spot on to ask; I certainly understand and support this.

There is an entry for Tech-Support in the upper right corner.

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My personal take on this is:
I haven't paid a lot of attention to USD and materials. The simple reason is that the translation of materials and color is all over the place, considering the vast amount of material systems on the market alone from 3rd party rendering engines. Yes, the idea that all fits through the definitions of the USD system.
But even that simple opacity problem requires some work. I often have my materials based on MoGraph, for example. That is, as far as I know, not an option. Even though I do not expect to have the MG set up arriving, the colors are gone. So, more work is needed regarding USD definitions and options.
Or take the Maxon Noises, animated perhaps; I haven't seen an option.
I need to dive deeper into it, no question. I believe it will get better.

Cheers