I think a big part of this is hype. We get a Wembanyama hyped to holly hell, all while he is shooting 38% from the field and 26% from 3, or whatever it is, and is small and skinny despite his height, but he can dribble the ball and can shoot a pull-up 3, but he does all this against inferior competition, so he looks like a freak of nature, and so he gets hyped all to holy hell, all while the more solid players with more solid skill-sets and NBA bodies don't get the hype. So the hype wins out and gets drafted. This explains Exum completely. The exceptions are the true freaks like LBJ, the cannot miss prospects, like Duncan. But they are once a generation if even that. Even Durant wasn't hyped like that. We cannot give in to hype. I hope Ainge is better than that, and by his drafting record I think he is.
But it is still way better to have one of the top 3 picks than not. Imagine trading back to get a Giannis-type player while collecting assets at the same time. That is the real dream in this scenario.