If you can predict what helps make more people more successful, then you can do more of that so i told y get that. So i see the downside of that. On the other hand, i think there is a bit of an upside for that, which is it gives you an ation of how multi factorial life and success are. If we could foretell some one's destiny from how long they could wait for a marshmellow in a single test, we could say to some parent: your little boy is doomed.
Also: why is it so hard to predict success?