Yes, I was really impressed to be contacted by a genuine developer with sensible questions when I gave feedback on the GitHub Android app beta a little while back (funnily enough, given other comments here, my concern was it had simplified away something I found useful!)

Reminds me of when HN added the [-] and everybody complained it was on the wrong side but they couldn’t be * to fix it.

I love that it's on the right. It means when on mobile, I don't accidentally upvote something that I meant to collapse.

that's because HN on mobile is bad, not because it's good UI

The up / downvote arrows are too close together. Always have to pinch + zoom to upvote.