Maybe Apple should write libraries for their GUI toolkits, then. It's awfully hard to beg people to write native apps for you when people need to learn a new language to do it.
That's more-or-less what I'm getting at. Apple can't replace Objective-C with Swift and expect people to not cock their head. They can either support a pre-existing language (like Microsoft with Rust) or home-bake something suitable for low-level development. Telling developers to not use the stuff they want to use sorta leaves their hands tied.
Microsoft's Rust support is basically non-existing for GUI applications, Rust/WinRT is miles away from achiving C++/WinRT parity, even more so with C#.
In its current state is only useful for CLI or services, unless you feel like doing WinUI team's work for free.