Every phone forum has a "battery" thread..... every... single.... one....
For each one I've tried... the common belief was usually overblown...
The s6 battery is good... first hand experience.... but I don't sit there staring at my screen for 6 hrs of my day.... wtf are people doing by spending 1/3 of the day on the phone.... I'll give the benefit of the doubt to those few who make 6 figures on their phone.. but they are rare....
Here`s the thing you are overlooking. 6 hours screen on time ensures you make it to the end of the day and into the next day. It doesn't mean you sit in front of your phone for 6 hours a day staring at your screen necessarily, even though you could do that. It means you can have 3-4 hours a day in screen on time and be left with 30-40 percent battery left with moderate to heavy use at 10-11:00pm. Only having 3-4 hours on screen time total means by early evening or late afternoon you may need to charge your phone.