When there are 6 comments, 1 is hidden:
This doesn't make sense. The amount of space is roughly equal to that of 1 comment. We should just show the comment instead, and save me the click.
If there are this many comments Show this many Hide this many 5 5 0 6 6 0 7 5 2
This has really been annoying me lately. Facebook does it too, and it doesn't make any sense there.
(When searching for dupes, I noticed an unanswered similar feature request from > 2 years ago here - not sure if that really counts as a dupe since it was never addressed or answered.)