For what it’s worth Dart is hands down the nicest OOP language I’ve ever used in my opinion.
It’s like they took all the good things about JS and Java and cut out all the bad parts. What’s left is basically Dart.
I think the decision of which cross platform technology to use mostly depends on a team's preferred tech stack.
C++ -> QT
C#/.NET -> MAUI/Blazor
JS/Web -> React.Native/Electron
Dart -> Flutter
This is what I think is holding back Flutter -- that it wasn't built on an incumbent technology. Because Dart doesn't have quite the following, it has to evangelize itself a bit more than the other options.
Rust -> ='[
Rust -> Slint? https://github.com/slint-ui/slint/