Too little, too late. Desktop apps are mostly dead.
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If you are building a Windows desktop application though, Microsoft does not want you to use MAUI. You use MAUI because iOS and Android are your top platforms and you want to target macOS and Windows without writing dedicated applications.
Linux has always been missing. This Avalonia port fills that gap.
You would not target the web with MAUI either. I guess "you can" now because WASM is one of the platforms that Avalonia supports. Again, I guess you might if you already have a MAUI app and do not want to create one for the web. But you would never set out to create a MAUI app for the web.