Looking at DirectX 12 Ultimate features still missing, doesn't really look like they come first to Vulkan.
Then there is the whole mess of shading languages going on, with the stagnation of GLSL, using HLSL as kind of alternative but not quite due to HLSL semantics, and then the explosion of alternatives.
Which DX12 Ultimate features are missing from Vulkan?
They may be missing from Roadmap definitions, but that wasn't my point. Vulkan is often first for innovation being accessible / possible in some form, but DX12 is usually first for "platform standardization", loosely defined.
Your comment about languages even reinforces the point: there isn't really an ecosystem for language innovation on top of D3D12.
Then there is the whole mess of shading languages going on, with the stagnation of GLSL, using HLSL as kind of alternative but not quite due to HLSL semantics, and then the explosion of alternatives.