Those quote by Lewis captures a major reason why my wife and I will likely homeschool our children.
In those days a boy on the classical side officially did almost nothing but classics. I think this was wise; the greatest service we can do to education today is to teach fewer subjects. No one has time to do more than a very few things well before he is twenty, and when we force a boy to be a mediocrity in a dozen subjects we destroy his standards, perhaps for life.
-C.S. Lewis, Surprised by Joy, p.113