Competitors seems to have a combination of: - Being more open-source - Have more contributors - Have a narrower scope
Maybe they should consider open sourcing all the tooling (like Xcode) otherwise the gap will only grow over time when compared to other languages.
And Swift is even more tied to Apple, at least to my inexperienced eye. I'm not really an Apple person (Linux, Android), even though I once really enjoyed their hardware... Swift is so far down on my list of languages to look at that I probably will never get to it.
Most of the devs use Mac, with some Linux. Everything is run in Kubernetes (OpenShift). we use JetBrains Rider as our IDE.
C# is a very nice, very performant (faster than Go) language, the platform is mature and robust. the tooling is excellent. It gives you good garbage collection, strong type safety, etc. All the things you need to build out the logic of business applications. And it's fully open source.
I have looked at Swift. By comparison, the tooling is 10 years behind and the performance is not even close. I struggle to see what Swift brings to the table over C#.
Also I find since C# is an 'enterprise' language developers take the p--s in what they want to charge for, as enterprise will pay as a 'cost of doing business'. Recently FluentAssertions, a freakin test assertion library decided they wanted to charge for newer versions. You don't get that in other languages like Python/Ruby etc.
Don't get me wrong, C# is my dayjob and I love the language but for personal projects where I don't have the money I'd be hesitant to touch it.
The language server is part of the SDK itself. The language server integration, debugger and all the features that make VS Code a good tool to write C# in are a part of base C# extension which is MIT-licensed and has no commercial restrictions whatsoever.
The only "wart" is that "vsdbg" - debugger it ships with is closed-source because it is essentially the same debugger as in Visual Studio but extracted into a standalone cross-platform component. There is an open alternative "NetCoreDbg" used by the extension fork for VSCodium (and various DAP bridges to Neovim, Emacs, etc.).