MAUI in .NET 7 checks many of the boxes you have here: - Native looking: MAUI supports native controls as much as possible - Cross platform: Nearly everything

MAUI in .NET 7 checks many of the boxes you have here: - Native looking: MAUI supports native controls as much as possible - Cross platform: Nearly everything but Linux today (and there are forks out there trying to bridge that gap); macOS (Catalyst), Windows, iOS, and Android - C# as the default .NET option is a very sane language. Other options may be possible with more effort. (Some people are still working on that.) - MAUI's focus is still on declarative XAML UI with databinding (MVVM), but there's a growing community for MVU (vaguely Elm-like) architecture including some official out-of-the-box support now.