I can click on a comment to mark it as read and then just display read comments (and set this as the default, by default it marks as read just comments you “looked at” which does not seem to work as well).

I can also tag a certain user, so stuff like “lemmy developer” will appear next to his name.

I also shows the sum of upvotes and downvotes i made to a guy, so if he has “-4” that means his judgement is probably not very good and i should avoid engaging in conversation with him, if it’s high it might be especially “useful” to start talking to him.

Another advantage of reddit (at least old reddit) that given the front page has a few default subscriptions i can remove some i am not interested in, on Lemmy “all” stream it looks like basically just communism propaganda/advocacy (So you are not going to start looking for regular stuff there, which makes people post less regular stuff and the circle continues), having the ability on the client side to block a specific instance or community could be useful (not to mention some people know people who lived on communist countries and heard some pretty bad stories, even if you think it was not “true communism” or something like that it can still give a pretty bad impression). There is the “remove” button but it is not clear what it does (It should have a pop up when hovering over him).