I frequently am unsure whether my fat finger tapped upvote or downvote on comments, and since they both disappear...well, I usually just tap "unvote" and do it again, but I'm still never really sure if I tapped the correct one since my finger is so much bigger than the buttons.
Thank you for this tip! TIL. I almost never downvote, and apparently I've seldom actually misclicked, so I had no idea there was in fact a UI difference.