Microsoft has fragmented DirectX badly and trapped developers that want to maximize their exposure using a version of it that hasn’t been significantly improved since 2003.

OpenGL 4.2 has all the same features that are worth pointing out that DirectX 11.1 does, and whether or not you can use it is not tied down to whether or not you paid Microsoft lately. (Nvidia and AMD both support OpenGL 4.2 on Windows XP or later and on Linux).

RAGE uses OpenGL 4.2 on the PC because it would be unplayable by more than two thirds of Windows users if they had gone with DirectX 11 and if they chose DirectX 9 as a lowest common denominator, it would not have looked anywhere near as good.