baseball is a stat game because a hitter vs. a pitcher is a one on one event that accurately gauges the individual ability of both, with minimal interference from other variables or influences. In basketball, literally hundreds of variables are all interacting at one time, to determine the success of individual players. Individual performances do not exist in a vacuum like baseball. Defensive pressure and adjustments, coaching/offense strategies, PG ability to find shooters, etc all influence performance.
Stat nerds in bball want to be the next bill james, so they have tried to shoehorn adv stats into the game. I echo the sentiments that they have their place, as they can give you a general idea of ability, but they arent an accurate gauge. Fcking Tyson Chandler's efficiency ratings and PER are out of this world, and the boy couldnt even create his own shot in a game of nerf.
Per and efficiency also tends to heavily favor those who do the least, and non-aggressive players.