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Your argument was technical so you got a technical answer. If your point was about choice of non proprietary options then you should have made that point (which I agree with moreover).
My argument was never technical; if you thought it was you completely misunderstood it. My argument was market-driven. Nobody is going to decide to switch from OpenGL to some higher level (possibly proprietary) engine just to support future versions of OS X.
Plenty of studios will. Those who use Unreal Engine or Unity have literally nothing to do to support Metal.
Nobody is going to *switch*. Yes, those using commercial multi-backend engines don't have to care. I'm talking about everyone else.
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