This seems like an argument against any standards at all and for NIH as a guiding principle. Using the logic presented here, you could just as validly say that

This seems like an argument against any standards at all and for NIH as a guiding principle. Using the logic presented here, you could just as validly say that WebKit shouldn't support HTML and CSS since they're not proprietary and not optimized for Apple's hardware and a lot of stuff rests on top of WebKit. Surely you don't actually think that, but I can't figure out how you can not think that but still think that "it's an open standard" is a knock against Vulkan.