And where is Vulcan standard? Windows games use DX. iOS is Metal. Android Open GL, ES, etc. Gaming consoles have proprietary APIs.
I would very much prefer games to use Metal on macOS (Starcraft2 is much smoother on the same hardware)
I would very much prefer games to use Metal on macOS (Starcraft2 is much smoother on the same hardware)
https://developer.android.com/about/dashboards/
And good luck finding a Vulkan version beyond 1.0, with extensions that work properly across all mobile devices.
http://vulkan.gpuinfo.org/vulkansupport.php#android_devices
You get a spectrum all the way from 1.0.0 up to 1.0.66, with Vulkan 1.1 promised for Android P devices only.