We want to try and support as many systems out there as possible and Direct3D covers that more than vulkan. For example, the Intel 4000 was a very popular GPU on entry level laptops for a number of years. If I type “Does Intel 4000 support vulkan” into google, the AI response I get is “No, the Intel HD 4000 does not officially support Vulkan on Windows, but it has a partial and incomplete implementation on Linux”. I also know that the vulkan driver for Windows ARM is actually a layer of extra code on top of Direct3D (i.e. vulkan on WindowsARM is really using Direct3D).
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