I dunno. Growing up, both my parents and the society did moderate (i.e. censor) the content I had access to. As an adult, I'm definitely glad that this was kept away from me as a kid. I was a pretty reasonable kid, but I'm definitely not confident I would have handled it well.
That having access to (some) of those things was overall harmless doesn't seem to be a settled question.
With smartphones, the thing that stands out to me is a survey they did of parents. For those who gave their kids a smartphone before they turned 16, literally every parent regretted the decision (and some of them gave them the phone willingly).
Granted, N was probably not huge in that study, but it's a rare study that has no variance.
That having access to (some) of those things was overall harmless doesn't seem to be a settled question.
With smartphones, the thing that stands out to me is a survey they did of parents. For those who gave their kids a smartphone before they turned 16, literally every parent regretted the decision (and some of them gave them the phone willingly).
Granted, N was probably not huge in that study, but it's a rare study that has no variance.