Well, that's just his (uninformed) opinion, man.
The non-pilot author should realize (and would if he had bothered to talk to any pilots) that a great deal of learning takes place during that 1,500 hours. Both from teaching and watching mistakes. Experience is the greatest instructor.
Weird how insurance rates decrease with hours. <-- free market at work, SonicFlyer.
But then again, he is "frequent traveler"-certified.