Even if there were a single phone that outperformed the Rift in real world responsiveness (and there isn't), that wouldn't really change anything because the wh

Even if there were a single phone that outperformed the Rift in real world responsiveness (and there isn't), that wouldn't really change anything because the whole value proposition of a generic smartphone printed solution is you use it with whatever phone you already have. If you have some phone other than that super phone, as the majority of smartphone users would, you then have to buy some specific $650 phone for the thing to give you comparable performance to the Rift, and you just spent more than double what a Rift costs.