The moment it went with Catalyst on macOS and forgot Linux exists entirely it was dead on arrival. It's Xamarin Forms but worse. Well done Microsoft slow clap.
I'm a C# dev but I don't really have faith in Microsoft sticking with any UI library longer than 5 years. They even seem to have embraced React Native to make their own products. I'd go with Avalonia if I picked a C# UI, but I prefer Typescript and JSX over C# and XAML.
From my experience with Xamarin i dont have high hopes. Every time i needed to some do something slightly interesting I had to write wrappers for both the iOS and Android API's to get anywhere.