Comment by jsheard

Apple could but they're not interested in non-native games, they want native ports or nothing. As I discussed a few posts over, Apple went to the trouble of developing a DirectX compatibility layer, but then told game developers they're not allowed to use it for anything besides evaluating whether their game would run well enough on Mac hardware. If they go ahead with a port then Apple still expects them to do it all the hard way.

It's textbook "perfect is the enemy of good" because yeah, compatibility layers have overhead, native is better, but if you insist on native everything but can't get devs on board then you just end up with no games.