Friendly reminder DirectX is a proprietary windows-specific API, with its associated lock-in.
Don't fall for such simple trap.
https://www.anandtech.com/show/12552/amd-announces-real-time...
Nouveau is still problematic because of the lack of access to the NVIDIA proprietary code, i.e. the extra bits like fan management, monitors, etc. That and it's performance still just isn't there against the proprietary drivers. AMD drivers are pretty good and Wine performance has increased significantly over the last year or so.
Hopefully Vulkan encourages more widely supported game dev, it's a terrible thing that gamers are practically locked into the Windows OS by way of proprietary graphics stack and the old catch-22 of 'no market for Linux games/no games on Linux.'
The gamer culture is not the same as FOSS one, cool games, getting hold of IP and belonging to a specific tribe (e.g. PS owners) is more relevant than freedom of games.
Currently Vulkan only matters on Linux and flagship Android devices.
It remains to be seen if Microsoft will ever allow ICD drivers on the Store or what is the actual use of Vulkan vs NVN on the Switch.
Direct3D has had world-class debugging tools and a reference renderer for years, meanwhile when I'm trying to ship OpenGL games the shader compiler doesn't even work the same across multiple PCs. (Vulkan fixes this stuff, yay!)
It sucks that DX is proprietary but the proprietary nature of it means that it can achieve things that are only possible with full integration - just like Metal on iOS and OS X.
Apple saved OpenGL from being irrelevant thanks to NeXTSTEP and their OpenGL ES push on iOS, because they needed to attract devs, now with the commoditizationof middleware among AAA studios that is no longer a relevant.
And it remains to be seen if Vulkan will ever get any adoption beyond Linux and flagship Android phones.
2) DX12 works on win10 only, which deployed to waay less than 90% PCs