There are great discussions here.

The problem is that we have too few users, so most topics you'd want to discuss aren't going to have existing thriving communities to chat with you. All of Lemmy put together is dwarfed by single reddit communities. for niche topics.

I'm not complaining, because the barriers to entry and lack of popular awareness keeps the user base here smarter and more interesting to talk to. But for the good of humanity I do think we need open tech like this to get widespread adoption, and it's going to take a long time. Reddit had almost two decades' head start.

And looking at a timeline, at this point in Reddit's history a few years in, the most popular subs with the early adopters were politics, programming, abe science. Sounds familiar, lol.