Apple created Metal waaay before Vulkan existed and moved their whole ecosystem to it before Vulkan was production ready. While moving from OpenGL to Metal was

Apple created Metal waaay before Vulkan existed and moved their whole ecosystem to it before Vulkan was production ready. While moving from OpenGL to Metal was a significant technical upgrade for them, moving all their ecosystem from Metal to Vulkan is just a lot of work for very little benefit. But yeah, sure, maybe they are just sticking with Metal to mess around with people.