I personally applaud Valve for braving to support as much hardware as they do. Even having built their own VR headset, they support a wide variety for their latest software a tacit show of support for the relationship of their customers and the VR ecosystem.

Perhaps this is anticipating Apple's upcoming move to a potentially new micro architecture that's been reported on -- I suppose if Apple thinks they need a software moat, they'll find a place to trench one up.