They aren't taught defense in AAU ball nor do they really commit to it for the most part.
In general such a true statement and yet it is the AAU circut where these kids today are mostly closely evaluated.
Part of the major change in recruiting the past 40 years. Was a time kids were evaled and offered based on their skills and what they'd ACCOMPLISHED in high school. Nowadays, it's all about the almighty "potential" and "athleticism". How fast can a kid run up and down the court, how fast can he change direction, how high can he jump for a dunk. Hey, we can PROJECT how he can be defensively down the road, after he's "coached up".
To me it's one of the conundrums of college hoops. I mean, it makes sense to me for the pros (basing decisions on potential), where you can almost literally have 1 on 1 coaching 24 hours day. But with the limited time the NCAA actually allows for coaching of kids in college, you'd think there would be a higher premium on kids who arrive in already KNOWING how to play defense, who already have high skill levels - even if their "potential" down the road isn't as high as it is for some high-flying Manolete....
I agree with you that too often nowadays we're evaluating an athlete based on his vertical, his 40 time, etc rather than on sport-specific abilities.
But if you can accept why the NBA would use those factors, why wouldn't that apply to the HS-college transition ? If anything, I think a kid would develop or learn more skills, be it from coaching or just experience, from HS-College more so than from college to the nba. But that's just my perception. I think going to college forces kids to develop skills. Whether they have 24/7 coaching or not. Who needs to play defense, or have legit post-up moves when, if you're 6'6, you have a distinct height advantage over most of your opponents in HS.
Then you show up as a freshmen and realize everybody is as big as you, or bigger. I'm sure it happens in AAU as well, but I just think the transition from HS-college forces kids to learn skills; a left hand, a post up move, a soft floater ... I think kids get by without some skills until necessity forces them to learn them. So, in some regards it makes sense to say, "this is what a guy will look like when he learns to play defense". For example.