What shocks me is how addictive everything is. It seems like people of mostly any age or persuasion can get into some kind of slop media or another. For video in particular, I refrain from going out of my way to watch any, but sometimes when I happen to see a friend engaged in watching, I start watching too and find it hard to escape. I can't speak to the cognitive effects confidently, but we agree on the vibe that it causes harm.