How on earth are you ending up needing to charge it during the day? If you start the day at 100% you need to use it insanely much, or with some really power hungry or really poor optimised apps with very high brightness on the screen for it not lasting through the day?
I for one charge it overnight, and then I will mostly end up having 30-60% when I end up going to bed depending on my usage and whether I had to use it in bright light so the display had to run at 100% brightness for a long period of time. I have yet to be able to go from 100% to under 10% no matter how much I use the phone during the day.
I work in a low-signal area, which is a large building with extremely poor cellular reception. When I turn off all radios except wifi on Airplane Mode, my iPhone survives A Day. That's it. When I leave the cellular radio on, my phone is dead by 7PM, no questions asked.
All I do on the phone during this time is text, and I can barely do that because of my job anyway. I get that it's easy to say "Oh lack of cell signal drains the battery so much faster" and that's true, but getting a total of 3.5 use hours during the day before it craps out is really, really bad. And then when you consider that my friend working with me in that building, in the same spot, has a GS5 on AT&T and somehow manages to eke 2 days from it, goes to show that
1. The thought of having a large-capacity battery isn't something to just be brushed off with a lot of pshawing and saying things like "Software optimizations!", and
2. Not everyone has the same use experiences.
It would be wonderful to see Apple release a phone with a great SoC, a great screen AND a great big battery. I don't think it would be unreasonable for anyone to want for all of these things.