It would not be solved without a culture shift. But with a culture shift, giving a kid an unlocked device would be as rare as giving them drugs.

I'm sure it will occasionally happen. But kids are terrible at keeping secrets, so they will only have the unlocked device for temporary periods, and I believe infrequent use of the modern internet is much, much less damaging than the constant use we see problems from today. A rough analogy, comparing social media to alcohol: it's as if today kids are suffering from chronic alcoholism, and in the future, kids occasionally get ahold of a six pack.

Doesn't the proposal as it's being implemented in the EU solve the problem under the exact same argumentation? Why are you dismissing a one proposal to then make your own that has exactly the same probable challenges?