But we’re missing an instance dedicated to that, a place people can port their S.O. answers to, and start building language or domain specific communities
@rglullis posting content (news about a programming language, frameworks and related tooling) to a particular forum doesnt make it useful as a Q&A, that is largely what I see in most cases.
Most of these niche communities lend itself for community support and discussion around specific problems. There is only so much "news" that can be had around specific topics.
I usually favor bias towards action in these cases: there is nothing bad about just posting questions to a specific community (e.g, Python) and until it starts becoming a problem. When/if people complain about the excessive number of Q&A posts, two things could happen:
The "I'm here for the news" people are in the majority, and the minority will then go to create an alternative "Q/A" community, like python-help or something.
The "I'm here for the news" people are in the minority, and they will either unsubscribe or create a separate "news-only" community, like python-planet.
Anyway, I'm all for the idea of using Lemmy for Q/A communities and I'd rather we have people pushing for it than waiting for some "idealized" version.
Community creation is open for all users, you are free to create a community dedicated to Q&A if you want a community explicitly for it. The admin team is willing to help out with moderation if that is what's holding you back.