I'm old enough to remember when it was TV that was supposedly wasting the time and destroying the youth. Before that, it was comic books. And movies. And even in the 19th century people were complaining about novels. Yes, in theory it is better if people do something constructive rather than just enjoy entertainment. But people can't be 100% in productive mode 100% of the time.
I call survivor bias. Books without action can render useless. TV can consume countless hours and does eat lives. Smartphones are the same, but more so. We must recognize the danger all these thing. Information without physical action is a danger.
Life requires balance. And everyone gets to decide what they do with their down time.