Earlier quoted context omitted.
We expect DirectX 12 drivers to be more complete, more performant, and more likely to be available out of the box without a separate install. We expect Windows browsers will want to build on top of DirectX, not Vulkan.
Care to back up those assertions with real world evidence?
The current Plan Of Record is that Intel® is not supporting Vulkan on Windows drivers. The drivers that were made available on Developer.com are intended for Vulkan developers.
So, it is expected that some Vulkan drivers may not work for end users.