Let's see... on one hand we have two devs who made it happen (for OpenGL; with Vulkan coming in the future), with essentially no funding, purely in their spare time and without any documentation, just by reverse engineering the hardware.
On the other hand we have a trillion dollar corporation, with 100 billion dollars in profit last year, with over 150k employees, with full documentation for the hardware.
Yep, it checks out. Apple's definitely resource strapped and can't afford to do it. No way they can compete with two spare-time hobbyist. Would be too expensive.
I'm sometimes really amazed how Apple-biased a big portion of HN is. People here can always find some sort of excuse to justify whatever shitty new thing Apple is doing (or why it isn't doing something), no matter how much mental gymnastics it requires.