I've written a response below, but the summary is that mapping from Vulkan 1.3 with dynamic rendering to D3D11 is easier than targeting the lower-level D3D12. The latter does have some form of dynamic rendering too, but I suspect the authors woud've had to re-think their CPU code much more than what has currently been done. Getting Windows Vista and 7 support is a freebie.
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I've written a response below, but the summary is that mapping from Vulkan 1.3 with dynamic rendering to D3D11 is easier than targeting the lower-level D3D12. The latter does have some form of dynamic rendering too, but I suspect the authors woud've had to re-think their CPU code much more than what has currently been done. Getting Windows Vista and 7 support is a freebie.