I am at 12 hours off charger and still at 81% with light to moderate use. Never had any issue with battery on this phone or my 928 when I had it. I can easily get through a day with heavy use. I have to ask what OP and others were doing all day to drain so quickly.
Emailing, texting, web surfing, WWF, and of course phone calls. That's enough to drain it in several hours. My phone will usually give me a warning that the "battery is draining quickly" about 25 minutes after I pick it up and start using it. It's the Danica Patrick of battery life. Not exactly terrible, but mediocre at best. Not quite enough to get the job done.
That's why I charge it up whenever I can. It won't make it through a day without an additional charge at some point.
I will admit that I did just about kill the battery one day with some Asphalt 8, but that's not my norm. That game will even drain my surface pro in a couple of hours. In fact, I haven't played since, but I wanted to download it and see how well it performed on the Icon. It screamed. The gameplay was absolutely identical to my surface pro, except the screen's smaller size meant you had to be really quick to avoid oncoming traffic.
Anyway, there's no mystery here. My last phone had a dual core processor, smaller screen and a 3300 mAh battery. The Icon's is less than 2/3rds the size, and its powering a quad core processor and 1080p screen. Clearly this was a design compromise. Any power user would find this battery smallish to make it through a typical 16-hour day. It's simply a numbers thing.
Finally, Indistinguishable is correct as far as it goes that turning off features will extend your battery life. And I have done a few of those. But at the end of the day we all buy phones so that we can use them, features and all. I love the QI charging, as it helps keep me topped up, but I can't help but wonder how much extra battery they could have fit in this housing if they didn't build in the QI charging coils. What's better - a phone that's easy to spot-charge to keep you going, or one that you only have to charge overnight?