I would love for this to happen. I’m no designer, but I enjoy thinking about design and tinkering in Figma. The reasons I don’t try to help on this front are because (a) I’m not a professional, (b) I doubt anyone appreciates a drive-by “design upgrade” without data pointing to why it would be better, and (c) I rarely have deep enough context into the application to make more than superficial helpful changes.

By the way, as a community we should look at the changes Blender landed in 2.8, which were (I think) considered a major UI/UX redesign that increased accessibility to the broader public.