Yeah, honestly, I stopped reading at the argument of 20 to 30 bounces not being enough to render a kitchen. I mean, this is still around 19 to 29 times more than what traditional 3D methods are using for environmental mapping. But more importantly, I don't think it's common (even in a kitchen) to have more than a handful of "bounces" being visible - things tend to get small at that point (unless we're looking at two large, flat mirrors pointed at each other).