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I'm not sure what Turing completeness argument has to do with anything. Turing machine is also Turing complete. You are going to make GPUs like that.

We are talking about a simple fact - Apple don't care to collaborate on Vulkan, neither when designing their GPUs nor for their OS. I see no point to further argue about facts. And I see criticism of that as completely valid.

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Supporting both Vulkan and Metal in a game engine is not a huge task. I work in the games industry, my job is to implement and maintain graphics backends to a renderer engine, so I can speak from experience.

Huge or not, duplication of effort is a tax. And no, it's not trivial as you claim. Especially when some engine wasn't designed from the ground up to address these differences.

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