I've met and worked with some of the most startlingly brilliant home schooled people, that are utterly crippled socially. They ended up being unable to work with others, despite on paper they ought to be leaders. People underestimate the critical value of childhood socialization. When a child finds they do not know the giant host of media nonsense other kids know intimately, they cannot participate in a huge amount of their imaginary fun which uses these media products as the foundation for their social set's humor and identity. That creates a very difficult to unseat insecurity.