Depends on the topic. From what I can tell, Lemmy skews young and technical and towards certain personalities and interests, so there are going to be topics that go to those strengths, but also topics where the discussions get mired down in either discussing the basics or get stuck in a pretty unsophisticated understanding of the topic.

It’s obvious with the hyper local discussions (where should I eat in this city when I visit), because there just aren’t enough knowledgeable people to form a quorum for quality discussion. But it’s also true in many of the hobby/interest discussions, simply because there aren’t enough people to where good discussion encourages more high quality discussion in a feedback loop.