Creating something motivates most of the people on this planet, and without going into specifics, I would claim that Gateses and Jobses of this world are not all that rare as far as their abilities are concerned. Situation and, well, luck, are a big part of where life takes people. And having been provided for will discourage most from being as driven to "succeed" (in either financial or tech/scientific sense, two most common accepted ways to success on HN).

Which is to say: don't judge according to your standards of "success".

And raising kids is anything but science, unless you have such a large number of them that statistics applies (though even then, you'd probably be breaking a bunch of laws if you tried to be scientific :)).

As such, addiction to screens is usually, imo, an addiction to specific type of content, or rather interaction (or lack thereof) type.