[58028641]

https://github.com/KhronosGroup/MoltenVK proves that it is possible, but it is limited by having to go through Metal.

[flohofwoe]

If Apple would add native Vulkan support to macOS, it would most likely also go through a Metal "emulation layer" (just like their GL implementation, or the D3D12 implementation in the Game Porting Toolkit).

[talldayo]

Because everyone knows from MoltenVK, Metal-based API implementations are just so efficient.

[astrange]

Anything's possible, but it wouldn't be performant. MoltenVK is just about as good as an untuned native Vulkan client would be.