C# and .Net are multi-platform, and have been for at least a decade. Javascript is useful for websites. And outside of the tech bubble, that's basically all it

C# and .Net are multi-platform, and have been for at least a decade. Javascript is useful for websites. And outside of the tech bubble, that's basically all it's good for. Yes, you can use Javascript for non-website stuff. But nobody is doing that because there are many cheaper and more efficient languages out there for doing all that other stuff.