OTOH and WRT the comment hiding (i.e. article topic) it's not hard to understand why YouTube doesn't want their comment sections filled with meta. HN "heavily discourages" it as well.
On the issue of hiding dislike counts itself, I don't think it's a big deal, as I don't believe it's the quality signal that some suggest:
1) there's the trolling behavior it encourages, which detracts from the meaning of dislikes
2) relative likes are sufficient, harder to game and less troll-inviting
3) the content, being video, speaks for itself more than text, making it easier to determine what's likely to be of interest.
4) what does dislike even mean on YouTube? Disagreement? Something else? I don't trust that there's enough consistency to give it meaning I care about
5) the number of views is also a better indicator of potential quality than dislikes.
In fact, on that latter point, the percentile of the percentage of the video watched, relative to other videos, would probably be an even better indicator.
That dislike count was essentially noise.