Almost nobody works with DirectX outside of game engine developers working on low level parts of the renderer, and there are probably only a few hundred of thos

Almost nobody works with DirectX outside of game engine developers working on low level parts of the renderer, and there are probably only a few hundred of those worldwide. That's why the new generation (dx12, metal, Vulkan) are so painful to use. No need to make them usable when so few people use them and they want performance and control.