I in general agree with this.
But... I will say what I want is a battery I don't worry that if I don't conserve some it won't even last til the end of the day. And I don't mean with normal use. I mean that even on days that I am using it heavily I'm not worrying (my 5 is no longer like that, I swear the battery just doesn't seem as good as it used to).
So, while as long as it gets me through a day I'm fine, I want to hear that in general it will last two days of use (not that I expect this honestly but that is where I'll be totally satisfied with battery use and not worrying about it anymore). Or at least one day of heavy use.
Anyways, that's the ideal I want to hear eventually when discussing battery life of a new phone. My laptop has pretty much almost gotten there (this years rMBP long as I don't want to use it for gaming

). The ipad actually is pretty good on that (iPad 2 even so it's old). But iphones just aren't there yet

. It's one thing I'm kinda jealous of the 6+, it sounds like it is close.