The Princeton offence is structured around sets and familiarity with each other, and was originally devised to make an inferior team talent-wise compete with better teams, so if that's your argument then you have a point. The problem with it is that most people don't even understand what it actually is or what the actual problem with the Lakers is.
And in regards to your other point, Steve Nash is nearly forty. He's in shape but he's not a fastbreak guy anymore anyway. His last few years in Phoenix were more about him handling the ball for 20 seconds, running multiple pnr and finding the best look. You don't think having Dwight and Pau to pnr with and hit at either the high or low post is a good thing? Nash won't score more than 10 a game or have more than 8-10 assists a game, just because of the rest of his team and Kobe. That doesn't mean he's not being featured enough because of the offence, it's because he's smart and realises he doesn't have to use the ball effectively on every play to win games.