The parent commenter isn't arguing the engineering feats required to achieve the extra bit of "thin-ness"; They're asking why that extra 2mm is so desirable in the first place. At the risk of sounding small-minded, I really don't see why today's phones and tablets should need to be much thinner than they already are. Sure, keep miniaturizing the internal components, but use the saved space for extra battery cells or storage. I'm not trying to fit a second phone in my pocket.
