How is this a useful response to the perspective shared in the GP?

Even if you don’t use it, it’s still a useful signal. Are you saying this isn’t the case? For example, did you find the dislike ratio to be a misleading signal, when it was around?

I shared to express that it wasn’t a signal universally understood. I never saw the dislike button as anything other than people hating on a video. There’s no context to it. You don’t know if the dislikes are people who don’t like the content or the author or the subject or the channel. In other words, for me it was never a useful signal. It only reflected how terrible the internet can make people behave.

I understand if my perspective is a minority opinion, but I think it’s a valid one.

I found the like/dislike ratio to be very useful, personally. Since it was removed and I have no signal as to whether or not the video is any good, the number of crap videos I end up playing has increased substantially. It's really annoying.

Yes, certain videos would get bombed -- but that, too, tends to be obvious and tells you something useful about the video: namely, that it's controversial in some way.

I've used it to mark spam videos that had no real content except for music and copy/pasted text from some other source