Your posts are becoming more troll-ish.
The numbers you report are unusually low and do not match my experience. My Air 2 gives me more battery life than my iPad 2 did when it was new, with the usage roughly being the same. Battery technology and optimization efforts have not remained stagnant over the past few years.
Right now, my Air 2's usage since the last charge (not just full charge, but any charge) says: 10 hours, 6 min , with 2 days, 12 hours standby. I have 24% left. Most used app: Chrome with 35%, which means web browsing with wifi on. So I'm looking at over 12 hours here, with the chief use being web browsing. The device runs at 40-50% brightness. I can take a screenshot if you'd like.
Those are hard numbers that I experience first hand and can repeat as often as I want. Now, you may well get absurdly low numbers while roughly doing the same as me, but that is representative only of your device, not of every other Air 2. If I got 7 or 8 hours doing this, I would have taken it back.