If I use a dislike button on a platform, it is typically because I want to warn other users away from that content, because its irrelevant, misleading, uninteresting etc. If likes and dislikes are primarily tools for personalising the algorithm to your taste then the platform may as well hide likes from public view as well.
I prefer to think of it as pushing out minimum viable products as soon as possible and implementing finer details afterwards. I think that's a principle of being agile.