To the author’s point, formal education is not so much about learning the curriculum, as about socialization. That doesn’t have to happen through school but you’ve got to get a group of people together somehow, and in the US that is through school. And it’s not a healthy environment, which does impact learning for everyone. It’s a little bit lord of the flies, but I don’t think the solution is to put everything online. And I know quite personally that a lot of kids (and adults) just don’t learn that way.