Probably there not enough content. Just the same repackaged in human or machine produced slop.

People are addicted to YouTube but I think the key to the healthy watching habits would be restricting the screen time.

Someone knowing about things he's interested in has few problems separating the new and informative content and if he had, say, two hours a week for watching he'd probably enjoy what he sees.

Two hours is just an estimate I came up with, it can be an two hours a month or hour a day. The important thing is that YT just doesn't create enough real new information and after that it is just slop and brain rot, regardless of your habits and filters.