You are expected to use Avalonia or Uno for multi-platform targeting or Gir.Core (GTK4) or one of the many other binding libraries for Linux-specific GUI.
Also very easy to throw something together on top of SDL2 with Silk.NET.
Practically speaking it is in a much better place than many languages considered by parts of Linux community to be more """linux-oriented""".
My personal use case is running old GUI apps, I am not planning on writing GUI apps with .Net , MS had the opportunity to open source .Net/Silverlight and make money from tools but they bet on Windows and today most apps are node and javascript, a much inferior platform but MS open things up too late.
Also very easy to throw something together on top of SDL2 with Silk.NET.
Practically speaking it is in a much better place than many languages considered by parts of Linux community to be more """linux-oriented""".