Despite of all the improvements they are trying to bring on the iPhone 6. I'd say the most important thing isn't a bigger screen infact we need a better battery which can last longer.
I don't have to pay more for a portable charger that I have to carry every where I go.
The battery life has been debated for a long time but it's likely the improvements were sacrificed for the larger screen (which the market demanded more of). Curious how many folks with Galaxy Notes will switch over to 6/6+, screen size was what drew many to the Galaxy Note. The Watch announcement was lackluster but as with all new "product categories," it's best to wait a generation or two before getting one.