It would likely be in addition to, but I think even those heavily invested in DX (whether using their own engine or on top of someone else's), which is certainl

It would likely be in addition to, but I think even those heavily invested in DX (whether using their own engine or on top of someone else's), which is certainly a shrinking group since there's a much broader emphasis on cross-platform compatibility these days (especially mobile), would still consider Vulkan if only so that the 35% of Steam Windows gamers still on 7 that could use DX 12 if they were on 10 can enjoy the benefits too. (There's even more reason to use Vulkan if there's a sizable set of GPUs that support it but don't support DX12, not sure about that though.)