For the typical (certainly US) driver, the initial training is just to get to a minimally viable set of skills so they can pass their driving test. The vast majority of people aren't taking performance driving courses to get their drivers licenses. I'd pretty much guarantee that almost every driver is more skilled 10 years after they get their license.
I cannot comment on driving experience/skill since I don't have a driver's license but I frequently observe drivers without a working understanding of the traffic rules and signs, even though they once learned that in the theory classes.
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