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Technically correct, the best type of correct (for a marketing team).

Microsoft does that too. It's infuriating.

But all of those run Darwin, so for something like a graphics API that has nothing to do with GUIs and whatnot, the "platform" for all of those is the same.

Says someone that never read Apple documentation or iDevice literature regarding system programming on Apple platforms.

You can start by reading the Mac OS X Internals, followed by Mac OS X and iOS Internals: To the Apple's Core.

Then hop over to Apple's archive, https://developer.apple.com/library/archive/navigation/

Fair enough :)

Which is correct, it is neither the same OS or hardware.