Been using VS and VSCode for a long time.
Don't care that the docs are open source.
My issue is that I guess I have high expectations for the official docs of a platform/framework/library/whatever. You shouldn't have to buy a book or read a random blog to find critical information on core functionality. The official docs should provide that, and Django is a great example. It includes how to do things, why things are the way they are, how to customize workflows, best practices, pitfalls, and on top of all that the source code is super easy to read and understand.
The pages at docs.microsoft.com are mostly just basic walkthroughs that leave me with a lot of questions. And the .NET Core source code is not nearly as readable.
It's getting better though. And I don't mean to take jabs at Microsoft because I truly do appreciate how much they've done in open source over the last few years, especially with VSCode.