Probably the best game to take in consideration if we wish to discover which actions can't be archived with only the front facing cameras is Echo Arena. This game is perfect for esports. Today Microsoft will start to sell inside out tracked HMDs and in my opinion it's better to start considering what we could lose if that system become a standard the way it is now.External sensors allow us to do very intuitive actions that couldn't be possible in VR using only inside-out tracking, those actions are natual, useful, funny and dynamic. I feel myself cool like cesar form planet of the apes when I play with a 360° freedom of movements!I draw this to explain one of those actionshere I was clinging with my right arm.... making circle movements.... and with that arm I was moving holding the corner of a giant airbone polygon, this means that my right arm was reaching close to my back and with my left arm I was holding the disk ready to launch it.And here there is another example.here I grab to the airbone polygon and push all my body in one direction by releasing the arms energy from the back. that is awesome.... and very natual as action... but castrated by the inside out-only tracking concept design because all of this could not be possible without external sensors.the last example, here I grab the aribone polygon than I push all my body to the ground, it's like a dip! and it's so awesome!....so with this topic I beg Oculus with CV2, Microsoft with current gen, and Valve with CV2 to do not abandon the external sensor tech for the future, or to evolve the inside out tech to reach those results, because it's simply freedom of choice in movements.p.s. Oculus please if possible let us use our old sensors with CV2 other then new ones if you are in plan to make a v.2.0 sensor.