Physics Collections
There are infinite collections for everything right now, except for physics calculations. Under the tab "Physics" there are only 20 Collections, which is an unnecessary constraint to handle it in that way. There should be separate Physics-Collections, that are handled like the View-Layer collections.
2 Comments
Something like this will be needed for USD / glTF rigid bodies support. And there should be option to name a collection not just treat it as a button. Maybe will be implemented in blender.community/c/rightclickselect/jLpB/
I think those old physics system are going to be replaced by geometry node powered solution that's why they aren't developed anymore and they still uses the old layer system from 2.79 area... While it might take a bit of time to develop a modern rigid body system into blender it's clear that this old panel isn't going to stay like this forever !