The .net CLR has a lot of the features that he would want to enable the kind of interactive debugging (variable hovers, REPL) he talks about, and Visual Studio itself supports a lot of them.
Personally going from doing C# development in VS2k15 to doing golang development in VSCode feels like going back in time.
I don't use Linux for ideological reasons, I use it because it works a lot faster (especially when using PyCharm - the difference is drastic) and more reliable than Windows and gives me "almost-MacOS-and-much-more" experience on my PC.
Modern apps targeting professionals and enthusiasts should be cross-platform (run on Windows, Linux and MacOS) and not force you to choose from just one or two major OSes.
For the real professional apps, the app is more important than the OS, so you choose whatever OS will run your app. Need to use Adobe CS, well, OS X or Windows is it, it could have been Linux and graphic artists would just swallow and use it, since they need to use CS. Likewise, a tool targeted at Windows app development would be fairly weird running on non-Windows.