With two kids, I'd say it depends on the personality. My son (10) is totally absorbed by screens and digital games of any sort. For him, I would have reduced early digital exposure had I known how hooked up he gets. On the other hand, my daughter (7) has as much exposure to screens as he does and she seems to naturally shift her interest between various things, the majority of which do not include smart devices.

Eh, I don't know. The only thing I know we are doing right is having strict limits on screen time.