The problem isn't that we miss out on some specific genius. The real issue with our system is that we have "Feynmans" working as waiters and driving taxis (and some other countries don't have that system and are maximising their talent).

It is interesting to critique this idea for introducing chance. Pitch this idea to a poor person, pitch this idea to a rich person...that is your answer. It is hard to understand if you grew up with opportunity but for poor people this randomness represents a tremendous improvement. From a system that is designed to crush them, to one in which everyone has the same chance.