most of us here grew up without smartphones, and we are doing pretty well technologically. it is the constant access to it that it is the problem imo, not technology in general. we do not allow kids to gamble, smoke, drink coffee, alcohol or other drugs since their prefrontal cortex is developing, why do we allow them a constantly available dopamine hit similar to, if not worse than the others ?

just ban phones and social media (and any other constantly available, internet connected distracting device) for kids under 20 or something. educate society about the perils of phone usage. let them use desktops and all the rest, I think it should be fine