Suggestion: Vulkan API

[Illya]

There is literally only one major game that supports Vulkan API: DOOM (2016). The upcoming DOOM Eternal will be the second.

No one except ID Software uses Vulkan for many good reasons, the most important one of which is that Vulkan is a low-level API and no developer wants to invest the significant time and resources optimizing the engine for a low-level API besides ID who do it mainly for ideological purposes. (ID was also the only developer that supported OpenGL instead of Direct3D back in the day too.)

All Macs and Linux machines can dual-boot into Windows. It has long been the accepted solution for PC gamers who like using Macs or Linux to boot into Windows to play their games. FFXIV is a well-optimized game which uses Direct3D 9 and 11 on Windows. I might add that the game also has a PS4 client which the developers also need to direct development resources towards.

Maybe you should be asking for the development team of this game which is constantly stretched for resources as it is to focus on the engine and platform they already have the game running well on instead of some API that literally no one except ID Software uses.