The moment I see the same question popping up more than a couple of times is an indication that it should be documented by somewhere that is actually indexed by search engines, normally the website/faq/docs/wiki as it is clear there is something missing.

To me, as part of a small team/project, it feels so much better to be able to use chat for every day communication just as I would at work. It allows a lot more expression in communication than forum posting. It has really helped us have a good sense of community and teamwork we might have not otherwise had.

I hang out in the Python discord quite a lot and it seems to work well for this purpose. I will say that Python's core library and many of the most popular packages are well documented, so it's definitely not a case where discord is the main source of knowledge and that's a good thing. However, a lot of people on there are new to development and don't know where to start, so we answer their beginner questions while teaching them how to search the docs for answers.