Not being an industrial designer or engineer, I'd love to know if Apple's engineering feats are truly more difficult than other smartphone manufacturers. How is it that Samsung, Sony and HTC etc. are able to crank out multiple devices with seemingly few problems (maybe they do, but I don't visit SamsungRumors.com) Meanwhile at Apple, it's one issue or another with the 5.5" iPhone's display or TouchID sensors. Are Apple's specs, that much more demanding? Are they truly pushing the envelope from an engineering standpoint. Or is it purely marketing spin to justify Apple's premium prices.