Yeah, I've… I can sort of understand the giant phone thing for a particular group of people…?
But on the whole, I mean… I've only ever thought the portable device should be pocket-sized. When introducing the iPad after a decade of failed attempts at netbooks and heavy tablets, Steve reiterated on that devices have to have a "reason for being," and that the iPad's was the ability to do what it does better than a phone and a notebook.
With the large phones, the only "reason for being" I can see is to satisfy that particular group (all right, not that it's wrong or anything), and to compete with rivals.
That said, I did like the original reshape of the iPhone from its original size to slightly taller for a true sixteen-by-nine screen size – that actually made an appreciable difference when watching things in coffee shops, et cetera.