> How can you give your child expert knowledge of physics, mathematics, history, biology, foreign language of choice and sports?

Who comes out of high school with "expert knowledge" in anything?!

The same could be said for a lot of university degrees for that matter.

Public education has only been a "normal" thing for a century and a half or so. It's certainly not the only way to turn out a competent adult, and that's assuming it actually does, which is becoming more and more questionable.