Because his total lack of understanding of how to play the game of basketball made everyone elses job harder. His inability to set a screen and hold it, instead of rolling before he was done screening. His inability to box anyone out ever, making other people have to worry about where his man was when a shot went up. His inability to be in the right position on the floor to create space for people. His inability to guard his own man in the paint and not lose him thinking about where the ball is.
He did not understand how to play basketball. His immense physical talents let him put up numbers, but made it harder for anyone around him to look good.