My main issue is that it's a buggy mess. The bars will be different shades and get stuck. I have to close the app to fix it (or at least had to now that I know I can disable it)

Also, not really a big thing, but I bet it uses a little more battery than it otherwise would

I noticed immediately because I thought I had a giant smudge on my glasses. Super distracting and I always disable it.

Personally, I dislike it because it makes my older devices lag noticeably, so I just keep it off out of habit.

Same, and when I have noticed it, I think it looks pretty nice at times. This is one of those cases of people just complaining for the sake of it.

If people want to complain about actual dumb UI changes; aim it at the new Discord mobile UI.

I disabled it after noticing it exists, which took a while tbh (it made some text harder to read)

Some people do, some people don't. I do, and find it distracting because it's not subtle enough.

I added it myself with a plugin for using Youtube on my 21:9 monitor

You and the other two agreeing with you here I think. Personally I think it's 100% a waste of resources. That shitty feature spikes the temps on my old laptop and the fans go nuts. If it was off by default I'd appreciate that feature (however there are SO many things I'd like YouTube to fix before adding nonsensical features like that).

For me, I can't get over the obvious banding and gradient artifacts, and it's just too distracting.

Same, but it would be better if it made it completely black when the light would be gray. So only show it if there's color or the video becomes really bright.

I really like it. It's cozy.

I've been wondering wtf it was doing this whole time. I'd been toggling it from time to time for what feels like weeks and I've never noticed what the hell it was changing.

I have no strong opinions on it. I like it better on than off