C#, or rather .NET, is pretty decent. I rate it lower than the macOS frameworks for UI development, but it brings a lot of functionality, which has been refined since the days of Visual Basic. Linux simply doesn't have that development effort. Completely understandable, but it holds Linux back, in particular on the desktop.

If you're not convinced: look at the difference between desktop Linux and Android. Although Android Studio seems to be a bit of a disaster nowadays, there's a lot of development support for Android, and it shows in the 1.6 million apps that have been built for it. Android has got what people crave: easy, slick, user-friendly apps, no technical hassle. It's an uphill battle, and at the same time, the focus is shifting away from desktop. So I think the year of Linux for the desktop will likely never come.

Absolutely