I recently went through this exercise and it really is sad. I actually decided to use the Godot game engine because at the end of the day it's fairly lightweight, you're in complete control over the rendering, the built in components are great (the editor itself is written in the game engine), it supports C#/C++, it runs literally everywhere, and it's completely free/open source.

I'm keeping my eye on Flutter and Avalonia as well but so far Godot seems the most mature on the desktop.