Vulkan is not just about off loading graphics processing but utilising and merging mutiple cores from multiple devices.Its the next stage of OpenCL and OpenGL.DX12 without the Microsoft issuesMany cards will not support it
Here is a link read all about it https://en.wikipedia.org/wiki/Vulkan_(API)
Good luck with getting support for that @Markidak. For a second I thought you just wanted someone to end all their phone calls and emails with a "Live long and Prosper".
Checking statistics on web most gamers are staying with windows 7 due to windows 10 privacy issues (and other issues, but mostly privacy).Having Ashes only available through DX12 might significantly limit future game population (enormous number of gamers will avoid windows 10 permanently).