As a developer who is also a Xamarin Forms user I can say - I get really nice performance out of Xamarin Forms these days. I'm not interested in React Native because it doesn't give me anything I can't do pretty quickly. This is also why I'm not interested in Kotlin and the Android SDK. I've been more or less exclusively developing Android Apps using Xamarin Forms for the last 18 months and Maui is way more exciting than anything else I see from other frameworks.