Going from DirectX to Vulkan to Metal is simply too many translation layers to work well. You're almost always going to end up with an annoying bottleneck and p

Going from DirectX to Vulkan to Metal is simply too many translation layers to work well. You're almost always going to end up with an annoying bottleneck and poor hardware utilization. MoltenVK alone might be fine if Vulkan was more widely supported by shipping games. I think it's more plausible that Valve decides to make a Proton for Mac using the D3D to Metal translation layer from Apple's Game Porting Toolkit—but that would be going against Apple's intended purpose for the toolkit.