I guess, but I (and would venture to say 95% of users) charge everyday anyway. I still have an original release day iP6 that works fine and has been charged daily since purchase. Same thing with a 4s that was traded in for that one after 3 yrs of use and no issue. At $79 for Apple battery replacement you can get a lot of batteries for the cost of the X IF required. But if a single battery will last 3+ years I am ok with that as by then its close to time to upgrade anyway for other reasons. Of course I am one who while would love a new device yearly just because, there is simply no reason to do so and I cant justify spending that kind of $$ for a telephone when the one I have works beautifully and does pretty much the exact same thing as the newest one does.
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Just seems a lot of folks here are stressing needlessly over it for various reasons (going to bed with a lot remaining, conserving battery cycles, etc) to the point where they cant just simply enjoy using their phone and charge it when its needed. As an example a user with these stats is not happy with battery life: 19+ hrs standby, 7+ hours of use and 54% remaining.