I hear this strawman all the time. The first thing you read when you go to stackoverflow.com is:
> Find the best answer to your technical question, help others answer theirs
And here's one of the first snippets on their about page:
> Stack Overflow helps people find the answers they need, when they need them. We're best known for our public Q&A platform that over 100 million people visit every month to ask questions, learn, and share technical knowledge.
Stack Overflow's website says nothing about this when you're looking at it briefly. They highlight the fact that it's primarily a Q&A site. The people that insist that SO is _not_ a Q&A site are needlessly defending the gatekeepers that have ruined the site.
Finally, it's funny that everyone always says that SO is supposed to produce high quality answers, because it stopped producing any high quality answers around 7-8 years ago. The new answers on the site suck. My usual routine is:
1. Google question
2. Click 5-6 different SO links
3. Get pissed off because the answers are all crap
4. Go to the documentation
5. Spend an hour to find the one small doc reference that actually gives me the correct answer.
I wish people would stop propagating this lie that gatekeepers are necessary for "high quality". It's a lie propagated by gatekeepers to defend themselves.