the case is closed
I said Apple have done their own research into what people want.
This is completely different than asking people what they want.
Do you see the difference? This is probably the root of why we disagree on this issue.
Second of all, that is not the best of both worlds. That's having to decide between two worlds. Their is a point of diminishing returns on making a phone thinner. At some point it effects the grip. For many people with normal hands that is being approached already so for those people they are forced to buy a case even if they don't want one.
Me having a thin light phone most of the time, and then putting it inside a thicker heavier battery case when I want to longer running time really IS the best of both worlds.
It is as if I have 2 phones, and I can swap between them whenever I want.
Would I prefer if Apple just made the phone a few mm thicker so it always had more battery life? No.
Would you? Yes, by the sounds of it you would.
I'd be perfectly happy if Apple release extra models of the iPhone6 with a few extra mm for you so you can have more battery life. But if they stick with the one size fits all then I'd prefer it if it was thin and light.
I know you would prefer big battery built in because you don't want the extra thickness of case, but you already represent the group of people who claim they don't care too much about thickness, so its hard to feel particularly sorry for you.
Hey, why not buy 30 of the battery cases and lug them around in a carrier bag when you roam around, then you won't have to recharge for a whole month and you can finally feel happiness again!
More importantly, battery life is one of, if not THE biggest complaint you see from iPhone users. I absolutely NEVER hear anyone complain that the iPhone is too thick or heavy. So taking a form that is already astoundingly light and thin and making it even more so in lieu of addressing battery life makes no sense.
Firstly you haven't been very professional in your information gathering and so I'm afraid you can't submit your findings as evidence in this case.
Secondly, you probably hang out with a bunch of battery moaners and sit around indoors telling each other miserable tales about how your battery ran out one evening, or wistfully dream about how awesome would be in your batteries lasted longer, etc..
Thirdly, and this is the main point, why do you think there is any correlation between A) What people say they want , B) What people want, C) What people will buy. I know that in the most contrived and simple theories A,B,C would all be the same, but you're not really that naive.
To me Apple does an extraordinary job of figuring out what users want before they even ask for it. I just think they are completely missing the boat on this one and if you listen to or read opinions of the subject objectively it would be hard to miss that point.
Not 100% sure what you mean 'read opinions of the subject objectively', how about I 'use the object subjectively and you read my opinions' instead, and I report that I like a thin light phone, which I pop into a thick heavy battery case when I need it.
Why don't you buy a battery case? I'm genuinely interested to hear why not.
should advertise the iPhone 6 as "just as thin as the last model, but with twice the battery life". Even if they had to increase the thickness a bit, it still wouldn't bother me. 
