.NET MAUI is coming to Linux and the browser

Too little, too late. Desktop apps are mostly dead.

That's why desktop machines and monitors can't be given away. Nobody wants them /s

Not in the industry I work in - AAA gamedev. Art folks typically would have two, or even three monitors - so good solutions for docking across them (and still working) are required.

A chrome browser by itself can't work that - it's great for many things, but not for Creative Tools.

Desktop UI toolkits are dead or stagnant but the desktop ui is still king IMO

MAUI is first and foremost a mobile UI framework. It was built for iOS and Android. The desktop is added on as a bonus so that you can target macOS and Windows as well.

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.

I would much rather see web apps become canvas rendered WASM versions of desktop apps than desktop apps become webview apps. Latter is what we have been seeing in the recent years unfortunately.

Canvas rendered cross-platform UI frameworks like Flutter & Avalonia targeting browsers (WASM), might shift the balance back in favor of desktop UI.