Well, I remember ye olden days of Usenet - we mostly got along without them, and without some of the issues they seem to cause.

Things change, though. Upvote/downvote was one of the many things Reddit and other places trialed over the years, and based on the success, stuck with it. Me, I barely spent any time on Usenet, but it occurs to me that the userbase was probably smaller. A much, much larger userbase probably fits better with upvote/downvote, so the comparison there is likely skewed, methinks.

'Dopamine rush' is exactly right, and I think it's useful and informational, similar to the way that people react to your statements and ideas in real life. I do think they can have an 'echo chamber' effect and help promote the problem that a popular thing or opinion can be completely wrong, but to me that just means that upvotes/downvotes aren't perfect, not that they should be completely discarded.

https://jacobdesforges.com/you-should-quit-reddit-distribution-wide/

Not sure what you want me to do with a link to a book, but I don't even agree with the premise of the title sentence. Reddit is still very useful to me, and I know of no other place that replicates the variety of content, there.