I found this article very interesting. With outboard DACs and Amps many folks here use, I don't have a problem with this at all with exception to the notion you would need a dongle or something else to power the iPhone/iPad. Realistically, I don't need my iPhone any thinner and I'd prefer more battery at the same size. Eventually I can see ultra thinness could offer some benefit through more flexible shapes, but that's not going to happen for a while. It's interesting to imagine power supplied from an iOS device versus through a dedicated source and might offer unique mobile products that reduce weight by using Apple's battery buying power as well as more control potential.