Actually that's not true. He's constantly catching the ball in the post with his back to the basket. Sure he'll take it and face up, he'll spine to the hoop, etc, but much of his offense is initiated with his back to the basket. You want him in the post - that is where he is most effective.
I've already done an extensive analysis of how his team benefits from him holding the ball top of the key, dribble/drive and score and creating for others, etc.
It's buried in this thread somewhere, but I'm too lazy to look for it.