True, but even now the C# library ecosystem is lacking compared to e.g. JVM/JavaScript/Python ecosystems. And that's definitely because it was historically closed source and mostly (but not entirely) single-platform.
I dont agree with "C# library ecosystem is lacking". The nuget ecosystem is massive, and the paid offerings side is much larger (owing to more of an enterprise audience generally). There arent a lot of well known projects that _run_ on the CLR like there are on the JVM, but the in-language ecosystem is just as robust as those other ecosystems if not more so.
