I don't really understand why Microsoft didn't do a Tauri like thing for C# devs instead of this Maui stuff. It would be a tiny project in comparison and then isn't completely going against the grain like Maui is. If you want a write once / run in more places compromise, the browser already does that very well.
Because web UI for a desktop app sucks compared to actual native UI. As a user, any time that I see an app uses Electron, Tauri or any of that ilk, I immediately look for an alternative because the user experience will be awful.
Worse than WPF?
Maui Blazor Hybrid has a cool model where the HTML UI binds to native code (not WASM) for mobile and desktop. That is the closest you can get to Tauri-like. If you want to run that same app in a browser, then it'll use Blazor with WASM.