>> And why would they? OpenGL is really unpleasant from a hardware manufacturer's / integrator's / OS author's perspective
That's exactly why they should keep it. Now all those CAD programs that use older OpenGL features have to figure out how to do things that are not supported by Metal. Vulkan initially forgot about this market as well and had to add some things back in.
There is Zink to handle compatibility, but that should have come from the organizations and companied deprecating OpenGL. It should probably be standard on new platforms so they can keep OpenGL at the API level.
That's exactly why they should keep it. Now all those CAD programs that use older OpenGL features have to figure out how to do things that are not supported by Metal. Vulkan initially forgot about this market as well and had to add some things back in.
There is Zink to handle compatibility, but that should have come from the organizations and companied deprecating OpenGL. It should probably be standard on new platforms so they can keep OpenGL at the API level.