I have to say I am really sad to see that almost everyone here disagrees with my thoughts on battery life! Mostly because if there is no high demand for great battery life, then the suppliers will make no effort to improve battery life.
For me battery life is the most important part of a phone - not because I use my phone too much or don't have access to chargers (although with the Note 7 the USB-C makes it more difficult to find available chargers from anyone) but in case of an emergency. The beautiful design, fast processor, nice screen, and helpful apps are all USELESS if my phone has died and all I need it for is to make an emergency phone call. I don't want "charge phone" to always be on my mind, or have to base my choices around whether or not my phones needs to be charged. Sometimes I forget to charge my phone in the middle of the day or moving around without access to a charger.
It seems, though, that I will need to adapt because most people are settling for mediocre battery performance.
Well a couple things to point out here.
I don't agree that Samsung won't offer the best battery technology there is. They need to stay ahead of the competition and that will be, for better or worse, iPhone. They will continue to offer the latest advance. It just gives them more reason to offer upgrades each and ever year.
Second - Battery life is actually the #1 thing for me. Meaning, I need to get through an entire 8-10 hour day. Thats about the amount of time I am going to be away from a charging ability at a max. My point was, it is extremely rare that anyone, 90% of us, are away from charging capability for that long period of time. Overseas flights offer charging. Coast to Coast doesn't take that long.
BUT - If it does, there are options, as I outlined, and those options can get take you from 30-60% topped off in 20-40 minutes.
If you "need" it to get longer, I'd highly recommend a Motorola Max or something like my son who is in school all day and then goes out has. He gets 20-24 hours easy. Yeah, I know you don't WANT that, so then you need to start making trade offs I suppose.
My OP was all about the psychology behind battery. I don't think people "NEED" to get 14-18 hours in a day given all the options tis phone gives you for fast charge. Just a 15-20 min "top up" can add 30-50% to the phone.
That's all my opinion and this is from someone where battery life is important to me. I am just not letting me control the decision to make a purchase for a device like this that can do so much more for me.