He isn't saying that being a doctor isn't great. He is saying that the people who add most value to science isn't always the ones who are at the top of the hie

He isn't saying that being a doctor isn't great. He is saying that the people who add most value to science isn't always the ones who are at the top of the hierarchy in the school system. Performing well in school is like a F1 racing car: very fast, but can only go on paths very well trodden already, i.e. paved road.