Comment by aseipp

DX12 was over 2 years old by the time Vulkan was released. People in the industry also use DirectX extensively and have for decades (Vulkan is fairly marginal in comparison); many modern graphics API features (mesh shaders, ray tracing) were designed and developed in DirectX, as Microsoft worked with closely with ISVs on these features before they spread to wider audiences and published specifications.

Honestly if you are creating games, with the rise of Proton and vkd3d, there is seemingly less need to target Vulkan today than ever before. Just target x86_64 Windows with DirectX11 or DirectX12 and you will even get Linux support (and some day, probably macOS) "for free". That's just for games, though.