> If there's a fundamental culture shift,

You mean this culture shift is needed for the masses but I don't think that's the case. In my widest social circle I am not aware of anyone giving alcohol to young kids (yes by the time they are 16ish yes but even that's rare). Most guardians would willingly do similar with locked devices.

The real problem is that the governments/companies won't get to spy on you if locked devices are given to children only. They want to spy on us all. That's the missing cultural shift.