After selling my PC in early 2015, I have had nothing but an iPhone 6 Plus for over a year — fortunately, almost all (~90%) of the software I used has become replaceable by apps. For those in fields like design and modelling, app developers have a long way to go, but for general usage, the iPhone can do almost everything a laptop does. I think one of the only things holding iOS back is the lack of an official file management system. Having experienced all of this firsthand, I can totally see why Apple is pushing the, "What's a computer?" campaign. It may not be a 1:1 solution, but it'll surely get the job done. What do you lot think?