If they're not that rare, why are they rare?
Where did I make a judgement on their success or even use that word? Are you replying to the right person?
I doubt you've looked into the theory behind screen addiction (I didn't believe it either). It's the vivid colors and the effects they have on your brain according to neuroscience, plus the manipulation that companies utilize. I've changed my screens to grayscale and have no such problems now.
I think I explained why they are "rare" even if they aren't: circumstances, motivation and drive to succeed in a particular way, a way you classify as "great achievements" (not success, sorry for equating it: I might have missed some nuanced differences there).
It's actually quite interesting that you even consider Gates and Jobs having "great achievements" (other than business success, which is clear), yet condone screen addiction (which their core business were mostly about).
A quick search does not give me any study relating technical properties of screens to addiction-like effects: do you have any pointers? (Other than the common "LED-light-interferes with sleep patterns".)
