I have yet to see much substantial evidence that statistical based scouting or player analysis is any more effective than traditional means. I will always believe the "eye test" is more effective.
It doesn't seem like you've spent much time examining the stats to be able to make that judgement with any degree of accuracy.
Well, feel free to provide me with some evidence showing where statisical based scouting, player analysis or otherwise has been any more instrumental in winning championships than any other means.
I've found none.
Although to avoid accusations of dodging your question, try the 2007-08 Boston Celtics. Heavily focused on statistically based analysis. Won championship.
What?
Statisical measurements were neede to know KG was a beast? Pierce and Allen were unknown commodities, that absent "stats", would have never been known to be high level players? James Posey, the perfect example of an "intangibles guy" was somehow discovered through advanced metrics?
Come on! Anyone with even a modicum of basketball knowledge could see how good these players were.
So what's your requirement to show that it works - a team of 2nd round picks wins the NBA title? The point is that nearly all successful teams employ these principles now. Let me ask you - can you name a recent champion that is NOT using advanced metrics?
You can't have it both ways - the Oakland A's didn't win a championship (metrics didn't help!) - the Red Sox, Celtics, Mavericks do (their players were too good!).
Your argument about KG / Posey is a strawman argument. Nobody said that advanced metrics give totally different answers. Of course some things are obvious (like that the Big 3 were talented), but that doesn't mean that advanced metrics weren't used to fill out the roster, influence the playbook, scout opponents, and so on and so forth.