The absence of a running karma total is a surprisingly powerful difference. I do still look back at old posts, and it's nice when there's votes, but without the little number next to a name or when I mouse-over a profile, there's no motivation to be the first in a thread to repost a cliche joke or to ragebait for fake internet points.
I think the “not having to be first” is what is so powerful.
I know that if I comment on a post from a few days ago on a populated community, I’ll likely at least get a reply from OP, if not a bunch of other people finding my comment and replying as well.
It’s like Lemmy is the nice, small-town version of Reddit (which is probably more similar to Gary Indiana).