I'm pretty sure the issue isn't Rust but the fact outside Browser UI, every native UI sucks.

And the biggest culprit is Apple by far, followed by Microsoft, followed by Linux lack of consistency.

We had Delphi and VB thirty years ago and the native UIs were pretty good. The web brought a massive regression in UI programming, functionality and usability that we generally haven't recovered from yet. Not every app can be a web site.