VS on macOS is Xamarin Studio rebranded, which Xamarin has never wanted to port for Linux (despite being a fork of MonoDevelop). I don't see MS changing that.

Project Rider is still extremely green and is not FOSS, nor free as in free beer.

VS Code is extremely limited and the little support it has is for .NET Core only.

I'm right now working on an MVC 5 project on Linux and I have to jump around MonoDevelop and Rider to have a workable dev environment; with the occasional jump to a Windows VM and Visual Studio to make sure everything works over there (it often doesn't).

.NET IS NOT a viable stack for developing on Linux and it's an inferior one in macOS. If you want to do real work with it you have to eat, breathe and live Windows and VS.

If I didn't absolutely have to work with .NET in this particular situation I would've laughed all my way back to a real cross-platform stack.