Apple has always been anti-gaming. It's been in the companies DNA since the first Mac was derided as a "toy" for having a graphical user interface, and they overcompensated trying to make it a business machine with no games.

About once a decade someone inside of Apple who is really passionate about games pushes some project through - you had GameSprockets in the 90's, you had someone convincing Valve to port Half-Life, you have GamePortingKit now, but it's just not in the companies culture to give game developers the long-term support they need.