On Windows, Vulkan is only supported via the legacy ICD driver infrastrure.
Unless there is market pressure for Microsoft to support OpenGL on the store, they most likely will not address it.
Certainly, but Vulkan games aren't perfect either. I get significantly chunkier FPS playing OW on linux via Vulkan for some reason so I prefer native ports wherever possible...
OW doesn't use Vulkan natively, you have dxvk sitting in the middle.