Agreed. I've seen cases where you had niche subreddits containing people who are somewhat experts, but when the sub gets remotely popular, it gets bombarded by people who don't know anything but feel like they can post whatever useless crap they want that has been posted a million times before. Eventually the moderators give up trying to control quality due to posts and upvotes by beginners, the experts leave in disgust, and the sub devolves into dumb conversations about the topic because now it's just beginners talking to beginners.