To me, it was the astounding amount of interactivity between the community.
At first I thought this was temporarily caused by the whole migration from the R site. But, just out of curiosity, I signed up to Mastodon and have enjoyed myself just as much as here.
Most of the Lemmy post's / Mastodon toots have almost as much or more comments / boosts than upvotes or favorites. It feels so organic and makes me realize how much these huge companies employ technics to pretty much force to interact the way they see fit.
It reminds me of that good old saying "you are not immune to propaganda", well I guess neither I nor anyone is immune to psychological tricks either.
P.S. I also love the fact that since there isn't pretty much any money involved, most opinions and interactions are genuine. Like, who is gonna pay this dude to advertise a book through BookWyrm? That increases immensely the odds that said person is being honest with their opinion of that book. It's amazing.
I've been thinking about this for the last couple days, and I agree. There's even the problem of duplicate "subs* popping up on other instances. Federation as it currently is seems to be something that works a lot better with a Twitter alternative than a Reddit one. There's probably some tweaks that can be done to make it a more unified experience. I have some ideas, but I don't think they'd work.
These are my suggestions, and I'm sure there's a reason why they haven't been done.
But you can also have multiple subs on reddit for the same topic. e.g. AI and ArtificialIntelligence. People choose the best one and they either stand or fall based on merit. Things will settle down.