Yeah, there's ANGLE which implements OpenGL ES on top of Metal, and then there's MoltenVK which implements Vulkan on top of Metal, so you can get a program whic

Yeah, there's ANGLE which implements OpenGL ES on top of Metal, and then there's MoltenVK which implements Vulkan on top of Metal, so you can get a program which uses the cross-platform APIs to run on macOS. Maybe that's the whole strategy? To provide an API which exposes what's easy to do in a well-performing way on their hardware, and let the community worry about getting the standards to work? It certainly seems to be working, and it probably means they need to spend less resources on driver development than if they tried to stay current on OpenGL and Vulkan.