Vulkan is mature. It has been used in production since 2013 (!) in the form of Mantle. I have no idea why all the Vulkan doomsayers here think it still needs a half-to-whole decade to be 'useful'.
I run all my windows games on Vulkan.
I don't think those lists are complete, but they seem to show the right relative amount of 3D API usage across PC games.
Proton is amazing and Wine project deserves your support.