Even if they want to, I think it’s technically very hard to accomplish. See this pic: https://docs.microsoft.com/en-us/windows-hardware/drivers/display/windows-

Even if they want to, I think it’s technically very hard to accomplish. See this pic: https://docs.microsoft.com/en-us/windows-hardware/drivers/display/windows-vista-and-later-display-driver-model-architecture https://docs.microsoft.com/en-us/windows-hardware/drivers/di... Many critical components are deep inside Windows kernel, in dxgkrnl.sys, they are very hard to unbundle from the rest of the kernel. Other critical components are in vendor-implemented drivers, both user mode (this part compiles shaders and implements many per-game compatibility hacks) and kernel mode (this one talks to actual hardware). Fortunately, there’re already third-party implementations of D3D on top of something else. Gallium 9, the main downside is no Intel GPU support. DXVK currently only supports D3D 10-11 and WPF is based on 9, but apparently some people are working on D3D9 support. There’s also VK9.