As someone who has had a driver's license in the US for a very long time, my experience is that--as with many things--one of the main things that makes you a better driver is putting in hours driving. Could you move more of those hours into a supervised learning environment? Probably. But you do that at the cost of making getting a license more difficult, expensive, and exclusive (in an environment where driving is often not an optional thing if someone wants to make a living).

I'm not sure how "more expensive training" eliminates some people texting while driving.