For an increasing number of "normal" people the phone is the primary computing device, mobile or at home.

However I'd be surprised if that trend applies to the HN crowd, which probably considers their phones as a secondary device, at best. An extension of the multiple other computers they use more frequently, something you need on the go, a mobile device that's used for quick glances and short uses, which gets relegated to second or third device at home. At least that's how I see it and it is why I value a small, portable form factor. Plus, I have small hands.