Too many people are confusing the two. Whenever lemmy.ml or its devs do something stupid, people go “Lemmy is getting worse and worse,” or “I’m leaving Lemmy,” or worse, “I’m leaving for Beehaw.”
If you’re using Beehaw, then you’re using Lemmy. Lemmy is the software these instances run on. If you don’t like lemmy.ml, join another instances that have rules that match your philosophy. Some instance hosts authoritarian or fascist shit? Turn to another Lemmy instance. Lemmy.ml is not even the biggest instance. People who just joined and are unfamiliar with the platform will just think the entire Lemmyverse is run by autocratic admins if we don’t get our terminology right.
A picture of a kitten in the appropriate general forum or a statement agreeing with the general opinion on a top comment on some politcal forum will get many times more Karma than a post on an expert forum that took 30 minutes to validate and write and is anchored on a decade of domain expertise.
Beyond it’s utility (for commercial social media sites) as a gamification element (a score, which incentivises people compete with each other in producing easilly digestible content that pleases the general population in a forum - which, note, doesn’t mean its correct, well researched or anchored in genuine domain knowledge), Karma, at least as done in Reddit, is near useless.
Maybe some kind of per-forum Karma or just a per-forum summary of the reception of past posts for a user might be useful, but “score”-Karma just indicates the ability to produce lots of content (so, produced quickly, hence almost certainly not validated) which is popular in large forums (which are invariably the generic ones).