...that must be hand- or bot- enforced by humans. More comments and posts, more humans. It took until last year for there to be any heirarchy amongst the humans, and until two years ago to prevent one human from de-modding all the other humans.
There are benefits to curation of subreddits but there are serious drawbacks, too. I would say the statement "forces the user to think about the sub-reddit's rules" is more accurately written "hopes that the user might someday read the subreddit's rules."