Rust Programming
Most GUI libraries in rust are in some version of 0.x. this isn't like flutter or Avalonia where our GUI libraries are mature. Wasn't Iced basically a one man show before system 76 started using it for their desktop environment and made huge contributions to it?
I think for now your best bet is probably a webview framework like tauri or dioxus. I'm sure things like iced will get there. But by using webview these frameworks have offloaded a lot of dev work. They've made painting pixels on the screen someone else's job
Wasn’t Iced basically a one man show before system 76 started using it for their desktop environment and made huge contributions to it?
No. And what they contribute, they contribute to their own fork.
They do, however, help the ecosystem with crates like cosmic-text.
I think for now your best bet is probably...
Their best bet was to ask around (done) and filter out the waffle. They already got a good specific actionable answer out of it.
I'd go with Tauri
GTK on other languages. Haven't found any rust ones or bindings that look worth a try yet, though. Should find the time eventually.
OP already mentioned relm.