Driver's ed at least used to be pretty common,in part because it gave a discount for the (expensive) insurance covering younger drivers. I don't see anything special about the typical driver's ed instructor anyway. It's not like the typical driver's ed is some expensive defensive driving course taught by an ex race car driver.
Furthermore, the typical system is that someone gets a learners permit first which lets them drive only under a limited set of conditions so they gain experience that way.
And, honestly, you gain experience by doing things not taking classes.