(Note that USD don't have option to export renderable objects only, so not sure why you talk about that as an example)
USD exporter "Visible Only" seems to use renderable toggle not…
Pose library uses asset library, consider looking at some asset library and pose library tutorials.
When working with quaternions, it doesn't make much sense to only key them partially. By changing only the X-component, you not only change the angle, but also the rotation axis itself. If you…
I don't believe this issue is solved, in my original project I went through every action and made sure the keyframes were completely and the pose corruption issue still occured.
So i decided…
No I see the issue, it's that the method of keying I used doesn't do it.
"Whole Character (Selected bones Only)"
Then is this a fault of the way blender applies keys?
I would try to key all channels but as long as the lock is present the keys don't apply.
Tagging @dr.sybren since this seems to be their asset.