> Because users can't set their own styles on mobile
Stylish works great with Firefox on my phone. Doesn't help you if you're using another browser or stuck with a phone which doesn't let you choose your own browser (do those exist?), of course.
I'd prefer a bit more separation between up / downvote buttons.
I'd prefer the text to be a bit larger, although I accept that some people would hate larger text. Is this the kind of thing that HN could have a setting for? optional style sheets? (Because users can't set their own styles on mobile).