You seem to have started with the premise that "tribal" societies are superior in some way. I disagree.

Additionally, kids have parents because they're extraordinarily unskilled at balancing the long-term perspective against the here and now (granted, many adults aren't much better). I find it hard to believe that just letting your kids do whatever they want is really the path to greatness for most kids. I think parents should help kids explore their passions but it seems there's a balance to be found where you also don't let your kids give up as soon as it gets difficult. My parents did that too often, and my wife's parents pushed her through the rough spots. I won't go into the whole results, but it's clear to me which is superior.