And it will be crap. What I want, and I'm sure a lot of other devs interested in making C# GUI multi-platform apps, is an UI framework à la Flutter that display the same thing everywhere. In the days of Electron apps not having a native look and feel is not a really problem anymore.
The saddest thing is that Microsoft actually offered that years before: Silverlight Out-of-Browser applications, that where running the same on Windows and Mac OS.