Svelte is my go to on the web as well.

For smaller apps (dozen input fields or so) the WinForms designer (which has been on life support for well over a decade now!) will get the job done better than anything else out there.

If you want GPU rendered, WPF has you covered. I strongly dislike XAML, even though I like JSX (while disliking data handling in react in general).

The thing about responsiveness is I can make 6 UIs in WinForms faster than I can fix cross platform CSS bugs.

The real issue is WinForms isn't cross platform. :(