Yeah, you're talking about the real world.. But how are you ever gonna train a player to be like those players?if you have a 6'6 guard with pour Inside Shot (slashing anyone) you'll have to play him at PF to increase that attribute. It's crazy!
Then again, take two similarly skilled PGs, one is 5'10 another 6'6, who do you think would dominate the match up in the real world?
You can try to train a balanced player, but it'll take you twice as long as training two different players with extreme heights.