This is a personal deal-breaker. The rest I can live with.
I get it. There's much less hardware involved, there's much lower manufacturing costs, those savings can be passed down to the consumer, bringing us closer to that hypothetical VR mainstream moment. I agree we need more headsets with this technology.
I've "grown up" with full tracking, though, and I'm used to it. It adds an additional layer of presence. I hope we don't get stuck with this downgrade on all future devices. Add Sixense to inside-out tracking and I'd be outright sold.
That being said, I already own the Vive with its lighthouses, so I wonder if I could use the Vive controllers with inside-out tracking HMDs. I guess that all depends on how much drift inside-out tracking suffers from, and how feasible it is to calibrate the two platforms.