It used to. Kind of. The APi endpoint for accessing someone's lifetime upvotes minus downvotes was never used in the webUI, and was removed completely a while back.

The devs don't want accounts to have "scores".

If you're just referring to votes in general, that's not what "karma" refers to. Karma on reddit is how much upvotes your account has gotten vs downvotes. How "good" you are.

The idea is that with that number visible, you get people "karma whoring". Posting just for the sake of it, often with low effort, either to inflate or tank their scores as high/low as possible.

Where can you see it in the Lemmy UI nowadays?