You might be missing the point. Dislikes are also feedback to users, the same way you can infer at a quick glance on HN that if a post is 10 hours old, with 30

You might be missing the point. Dislikes are also feedback to users, the same way you can infer at a quick glance on HN that if a post is 10 hours old, with 30 points, the probability is high that the reward might be low, even if the title appeals to you. YouTube is not just YouTube, it's also a tech juggernaut and thus a UI trend setter. A few months ago they stopped displaying negative feedback to users, a major indicator. They certainly won't discuss with us the result of that experiment, at least when it comes to UX. Telling someone that the topic is not relevant to HN might just be a reflection of your own personal preference on how people should use this community. Also keep in mind that in the past, discussions of that nature stemming from these very threads have at least influenced changes.