Because the average user runs countless tests in real life? No, sorry. Again, you fail. The average user uses their own real world experience or compares their usage to a friend who owns another phone/brand.
As stated earlier, I sit at a desk, so I charge my phone throughout the day if needed. But I can see how other users would want longer battery life, without having to buy special cases. If you can't see that, then you're arguing for the sake of argument.
This is the only thing that "concerns" me about the iP6. I just don't like the lens protruding on the iPod, really hoping it doesn't on the new iPhone. Since I don't use a case at all and my phone lies on the desk all day beside me, typing would be annoying as it wouldn't sit flat on the desk.
You have all the answers, don't you? Maybe this person's job doesn't involve driving. Maybe he or she is out in the field all day w/o access to power and doesn't want a case. There's nothing wrong with hoping for the iP6 to have a better battery life. I work at a desk all day but I share the same hope. Shocking to hear, perhaps, but not everyone's situation is like yours.