I think they are saying the fair comparison should be what another 1st party GPU maker supports in their 1st party drivers, not whether or not Windows provides 1st party Vulkan implementation for 3rd party hardware.
replyMicrosoft has the OpenCL, OpenGL, Vulkan compatibility pack. Major issue is that it's just Mesa compiled to a D3D12 GPU backend, so if you have anything but Snapdragon it's basically useless.
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