It has to do with AAU ball.

There are a lot of coaches in AAU ball that hope they can make it rich by becoming the "father I never had" coach of these young kids, and then steering them to a school for a "price," or hoping these kids make it rich in the NBA and take care of them. And so from a young age these kids are pampered and fawned all over bu AAU coaches, who realize that at such a young age pure size/athleticism tops all but the very best coaches teams, and thus emphasis is placed on assembling talent instead of developing it. And so the most gifted players who are used to having their asses kissed all day long since they are in middle school, are less and less receptive to "boring" practices like learning fundamentals. And in order to placate these pouting spoiled brats, the coaches spend more time trying to figure out how to work in ally-opp dunks in their offensive sets.

This more than anything else is why guys like Coach K, whose philosophy is centered around team defense and fundamentals, recruit kids like the Plumlee brothers, Ryan Kelly, Lance Thomas, Brian Zoubek, etc, who rarely ever get recruited by teams like Kansas, Kentucky, UCONN, Syracuse, or Texas. And when Coach K does recruit good athletes, they are generally kids like Grant Hill, Jason Williams, Nolan Smith, or Gerald Henderson who come from strong families where discipline and strong paternalistic support isn't a foreign concept.

The drawback is that even the best coaching can't always over come raw talent. And this is why so many Duke players flame out in the NBA, and why Duke frequently loses to very athletic teams but hardly ever loses to other "well-coached" teams.