I don't even think it's been about asking good questions, at least not for many years. I used SO regularly and even when I wasn't asking a question at all, it was an incredible slog to just find a concise and correct answer instead of sniping comments from people who wanted to flex knowledge, or others answering from some oblique perspective that had nothing to do with the original problem. Asking good questions is always important, yes, but if the community does not know how to provide good answers, seekers seek elsewhere.

Side note, great html book here on asking good questions, since we still absolutely have that problem to deal with even when using Gen AI as a starting point; http://catb.org/~esr/faqs/smart-questions.html