Agreed. I don't think many kids could make it through 2 episodes of Mr. Rogers w/o wanting to do something else. I remember being really bored with my choices of shows / movies growing up. If I was a kid today, I think I'd be on YouTube every waking moment.
(The "there's always more [content out there]" component you mention - something I am very familiar with as someone with ADHD :X - folds nicely into the mesmerism/relive component described above.)
Where I learned about this recently: https://www.theglobeandmail.com/arts/television/whats-paw-pa...
Linked from: https://www.theatlantic.com/family/archive/2020/02/how-toys-... / https://news.ycombinator.com/item?id=22259025 (9 days ago)