Why do you guys not properly supporting DX12?

49.04% of all Personal Computers in the world run Windows 7 - DX12 - No,Vulkan - Yes
Windows 10 is only 26.8% - DX12 - Yes,Vulkan - Yes.
Linux,Mac OS X,Windows XP,Windows Vista,Windows 8,Windows 8.1 - 20.56% - DX12 - No,Vulkan - Yes
69.6% of the Personal Computers in the world Do Not Support DX12,but support Vulkan.
(True to June 2017 OS market share)

These statistics seem just plain wrong.
Let's take a more appropriate test for this situation: Steam Hardware & Software Survey. People that use emulators also often use Steam, so this is a more reliable test than some random OS market share test.

http://store.steampowered.com/hwsurvey/

50% of users use Windows 10 x64, followed by 32% Windows 7 x64.
It's not a surprise since Microsoft shoved down the update for Windows 10 the way they did.

Anyways, D3D12 is irrelevant because it only supports one OS. Vulkan allows for the same performance gains, so Vulkan is supported instead.

If D3D12 ever gets improved one day, it's only having old hardware in mind. But old hardware will have trouble running games properly anyways, so..