Last time they did with Web 3.0 and it didn’t went well

I don’t see it. Where is it?

Yes, because it can be an indicator of reputation of someone.

No, because of the ease of getting it, as well as it can be a basis of someone’s ego.

Actually, any number that is attached to person has the same set of pros and cons, except of the ease, persumably. This includes SO’s rep system, Reddit’s karma system, YouTube subscriber/view/video count, Twitter followers/post count, etc. Adding karma system to Lemmy may have its side effects, but even there isn’t one, it may not matter since Lemmy has post and comments counts.

EDIT: In the end, when I’m reading Reddit or Lemmy, I gave no attention to the karma, and instead the vote count of the post/comment itself. Call me ignorant, but whatevs.