It is up to Khronos to make it more interesting to do otherwise.
Hardware Transformation and Lighting, CG/HLSL, RayTracing, MeshShaders and more recently DirectStorage, are all examples of features that appeared first in DirectX, with AMD or NVidia hardware implementation, before showing up as OpenGL or Vulkan extension.
That's pretty sickening, I hope the EU will give them a rap across the knuckles for that. Very anti-competitive.