When left to their own devices companies have little tendency to cooperate on that level. The proprietary drivers represent an enormous investment, it would be

When left to their own devices companies have little tendency to cooperate on that level. The proprietary drivers represent an enormous investment, it would be near-impossible for a new company to enter the market and develop competitive proprietary driver stacks for DirectX and OpenGL. Maybe some day in the future the various GPUs will have code gen backends in LLVM/Microsoft compilers without needing secret & broken vendor drivers and we'll be down to one set of bugs per platform, instead of <dx-win|ogl-win|ogl-mac|ogl-linux-proprietary|ogl-linux-free> x <amd|nvidia|intel> = 15 combos.