[hifigi]

I make no argument against what you've said except you used Valve as an "appeal to authority", when they have a vested interest in promoting Vulkan (since SteamOS is based on Linux). So of course they will be persuading developers to use Vulkan over DX12, because it broadens the domain of users who can buy an individual title on Steam.

[ioquatix]

If you look up the endorsement by Valve, it's not just a straight up "Use Vulkan" but a well reasoned set of arguments and case studies by people with a lot of experience. So, this is not an "appeal to authority", but a reference to an existing body of research which supports my assertions.