Vertex Group Collections

Vertex group collections would allow you to organize your vertex groups into a hierarchy. This could be useful for separating vertex groups used for weight painting and vertex groups used for storing selections. Also, linked duplicates would have a hierarchy of vertex groups inside them, so it would allow linked duplicates to have more complex multilevel meshes while maintaining organization. Collections would allow you to select all vertex groups inside, just like collections in the outliner. The vertex group revamp would also allow you to use vertex groups exactly the same as they are now, in Blender 2.83, except there'd be a "new collection" button.