Maybe people switch to entertainment because it's what they'd prefer.

two hours of group sex followed by two hours of high-quality quantum physics lessons would give you both more pleasure and more knowledge than four hours of playing Monopoly and having small talk

Definitely not. That would be like eating a hundred tomatoes, then a hundred leaves of lettuce, and then saying that it's better than a salad. A mix of the two is more enjoyable, at least for me.