Agree re using the ux tag more, in all three categories! People who care alot about ux can then watch that tag.
Seems we’re not quite aligned yet though - to my mind Contribute > UX can contain both bugs and feature requests but they have to be small “quality of life” improvements and nothing big. If something is truly broken in the UI then it goes in Contribute > Bug. If it’s a major project (e.g. allowing editing of meta description of a tag) then it goes in Contribute > Feature.
How would you improve the Contribute > UX category description to match your understanding of things?