I gladly suffer the ux for the information density. I occasionally favorite comments that I meant to flag, or vote the wrong way, but these actions are all undoable. I've never deleted a comment by mistake; there's a confirmation prompt for that.
Ha. Just tried to upvote your comment and opened your profile instead. Still appreciate the information density, but I can see how it’s a pain for people who are more active here than I.
Why not both? I don't think HN uses its space on mobile that well to begin with. You can make small tweaks to improve readability while simultaneously leaving more space to add in properly sized actions on comments.