Or they could get done with "one size to suit them all" and offer more screen sizes. People hands vary wildly in size, no one would make gloves in only one, but somehow Apple seems to think for a phone it's OK.
Gloves frequently do come in one size only. Adding wider ranges of screen sizes increases developer testing requirements so I'm glad they haven't, and whilst Autolayout does abstract a lot of those headaches it doesn't resolve everything.
Plus gloves do often come as one size only. Depends on the glove type, material and manufacturer.
Only if you don't have a very compact phone, like the iPhone. Motorola has been making 4.3" phones the size of a 4" iPhone for a while, for example. Even the 4.7" Moto X isn't much bigger.
