It looks like this is going to become a tipping point for which Vulkan and DirectX offer competing system calls for accessing a computer's GPU. The UWP being shown here will be essentially locking developers into using the DirectX library and drop future support for Vulkan against what users want to see in gaming as being platform-agnostic. Coming into this console generation, gamers wanted to see games from AAA publishers be able to come out on X1/PS4/PC faster because of similar system calls; such that code for one platform wouldn't require a total re-write to work on the others. MS is now wanting to lock out developers from using an open platform such that their calls will be different and "better" than those made by an open one.