There are two types of YouTube comments. There are comments from random people on very popular videos. Those are often an excuse for people to say something with a big audience, and those comments have usually been of low quality. The other type of comment is when there's a small community around some particular niche subject or particular content creator. And there the quality of the comments can actually be pretty decent, because it's not just drive-by comments from random folks. Unfortunately, YouTube's comments changes have generally targeted marginal improvements on the quality of the first kind of comments to the detriment of the second kind.