See also: Not supporting Vulkan or OpenXR at all, using USD instead of glTF for AR content even though it's less well suited for the task, etc. (Well, they probably don't mind that it helps maintain the walled garden either... There's more than one reason for everything)
0: https://docs.google.com/document/d/1F6ns6I3zs-2JL_dT9hOkX_25...