Having tried all three, its a stark difference in how much more social Lemmy is comparatively. Its not even close. Almost all posts I've encountered on lemmy have interaction; whereas, more often than not, posts on the other two platforms have no interaction. Wonder what the driving factor is behind this difference?
I find microblogging format isn't really great for having any sort of meaningful discussion. Mastodon is good for posting news or memes, but that's about it. Lemmy format allows having an actual dialogue, and that makes it a lot more engaging.
I think had all neolib journalists suddenly brought the chat over to mastodon ala bluesky the whole landscape would be different (and the EU would be feeling itself more)
It's great for seeing existing dialogue, but I think it falls short for long term discussion between more than two people.
On a non-threaded board (e.g. forums, github issues) you can watch a thread you're interested in. On Lemmy/reddit you only get notifications for direct responses to your comments.
I think some sort of option to watch/unwatch whole subtrees of comments would help a lot.