Is it the same for downvotes?

Yes

It’s honestly a big downside. I can see it being useful for admins on their own instances to detect brigades or vote manipulation coming from different servers, but I don’t like that they are public, because it could discourage people from voting honestly on topics where they could potentially be harassed for engaging

And anyone can be an admin. You can just make an instance and appoint yourself an admin. So in practice it’s not limited to anybody.

It’s just an option on every post

https://i.imgur.com/j5ZB8vi.png

On the regular Lemmy UI you can see the option if you’re an admin (on any instance, not just the one the comment was made on)

No, it’s on Lemmy too

The accuracy of the votes (lack or vote fuzzing) and the ability to view the split of upvotes and downvotes individually, as well as who voted for what

The latter point can be seen as a kind of disadvantage though. I don’t like the fact that anyone who is an admin on any instance can go to another instance and see the identity of every voter on any post.

1 step forward, 4 steps back!