There was a discussion about "ghost communities" a few days ago:
https://feddit.uk/post/24499702
People are quick to create communities but they sit unused, attract few posts and fewer subscribers. Often the mods move on so even if new posts were to appear they'd be unmoderated.
The simple reason for that is there isn't enough demand. Lemmy is still small it's too early to be spinning out ever more narrowed niche communities. If you think content belongs elsewhere then report it to the mods and let them decide. If they see a surge in unwanted Q&A topics then they can amend posting guidelines to direct people elsewhere or to a Q&A thread or something.
Your comment "This question does not belong here." currently has 22 downvotes and 1 upvote.
To me that suggests your view is in the minority.