As long as he did not exclusively learn technical stuff but also got a humanistic education, which we do not know, and enjoyed his childhood, which I think he did, because you cannot perform like that without enjoying it, I think this is pretty amazing parenting.<p>You could find other reasons to nitpick (Did he do sports? Did he develop social competences by interacting with other kids?),  but even if these things are true, which we do not know, there are children, who got a regular education, that are still lacking in these regards and they are not enrolled at MIT at 15.