Hold your horses.
https://store.steampowered.com/steamlink/about
but steam link "app" what has that to do with anything.
1) Valve were one of the big component behind pushing VR giving tech-demo's giving away their tech, hardware and software and their research for free before HTC agreement.
2) Valve were pushing the streaming from PC to gaming into other area's outside of desktop, both mobile and to the tv, citing AppleTV (back in 2010) was the perfect killer platform to act as a central hub for everything (streaming from desktop to TV, having all your iOS apps available on the big TV, etc etc).
3) steamlink and stream machines where the push, steamlink and the controllers where all that survived.
4) steamlink app now launched in 2018 for iOS (apple removed it, but it is in consideration again), and Android.
- this gives players a chance to stream over the the network to media hubs, and onto mobile devices.
Media hubs make sense
But why downgrade your big PC experience onto a silly mobile like your phone,
The user case:
Phones can act as a poor-mans VR headset, the phone act as a input devices, feeding orientation and coordinates back into the game, whilst your PC does all the leg work. ( with the special caveat condition it's not perfect VR of a full system, but it's free and available to all who have mobile, cardboard, decent wi-fi).
Sadly the steamlink App has only just been deployed before the summer, Apple needs to get onboard,
and Valve might not pull the trigger on VR via the mobile Steamlink App, until phones/wi-fi speeds are up to speck, so motion sickness is not detraction from public adoption rates, so they might put it on the back burner, but gut feeling is it's in the bag, on the table ready to go just give it time.
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valve time......