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Lengthy analytical comment debates in every trending thread. I'm not saying it's absent, of course, but there is a distinct lack of detailed high-level discourse.
To be fair, the same has plummeted on Reddit in recent years, but that's the major drawcard that Lemmy will take years itself to emulate.
Your experience may have been different than mine, but I found that I've had more thoughtful, lengthy discussion on Lemmy than in the final few months on Reddit.
Sure, the topics I viewed were more broad over there, but discussion on popular threads just get lost in 1000 comments and even trying to spark discussion with people in New got me fewer bites than here. That and the antagonstic form of debate were turnoffs for me (sadly, a bit of that did also migrate to Lemmy).
Users here actually sort of listen to each other. Non-bot OPs will often reply to you. People will understand what you're saying even if you have a typo, without having to dedicate the entire comment about it.
Yes there are plenty of trolls here too, but overall my experience has been more pleasant than my 6 years on Reddit. Feel free to tell me about your experience, I'm not here just to disagree with you.