I agree with you about C# there. I don't use it really at all, but the times I did it felt like I was writing Go with how nice the stdlib was and that I could just use the dotnet CLI on Linux too. It was pleasant and productive to use.
do you mean use none core libraries / 3rd party libs
or using libraries from different languages like how some libs or frameworks from different languages create bindings to python libs
many C# libs are available via Nugets, which are not more or less complicated than other languages package managers
i personally think C# package management is more obscure, compared to other languages
I mean that in both cases, the core language platform provides the tools and libraries you need to develop complete applications; you don't have to introduce external dependencies or resort to writing low-level data structures and data types.