The school system is an efficient capitalistic means of educating our youth at scale. The author doesn't offer a valid alternative to this means. What does he plan to do with his time outside of school? Take up a trade? Start independent study? In most cases, the path to a career will involve some form of classroom or boring on-the-job training.

We certainly, as public policy, can't allow all 15 year olds to just do whatever they want with no structure. Unless we want rampant alcoholism, crime, and teen pregnancy. Our current school system provides a social net for children in a society where most of them wouldn't have parents at home during the day to guide them.