This isn't a dig on Rust, but wherever Rust runs, so does C++. There are a lot of dimensions where Rust is better, but definitely not "runs everywhere" and "ecosystem".
My main gripe with QT is that apps created with it are, as a rule, ugly and non-native feeling.
My suspicion is that this is because QT widgets sort of look like native widgets but aren’t quite there, causing it to fall into some kind of “uncanny valley” analogue.
From my experience, the same is true for most Rust frameworks. In fact, I don't think there's a single stable Rust GUI library that tries to accommodate system controls.
You can use the win32 API on Windows and Gtk on GNOME, but for KDE and all else you'll need to use some kind of Qt wrapper that has the problems you encounter.
Yes, QT on the desktop is very good. There are bindings for Rust too, as there are for most languages, but the most integrated one is C++. (I'd say the close integration is just not worth it.)
Anyway, I don't know why people want so badly a single language to run on every context. They are forfeiting a lot of value for that.
with this demo: https://github.com/DioxusLabs/example-projects/tree/master/e...
QT is unusably slow. Dioxus is indistinguishable from a Javascript app.