It seems like any platform that features link aggregation is soon overrun by bots and self-promoters trying to drive traffic, and pages and pages of link posts versus pages and pages of people talking.
Are there any lemmy instances or other defederated networks that focus on Q&A, niche communities, and people conversing, instead?
Mastodon is much more this way than Lemmy, in my experience. I honestly don’t know too many Lemmy communities that are that way, but kbin / mbin will let you interact with Mastodon users on a chat basis in addition to Lemmy communities.