Get up from hotel room and leave before 8 to make it to the conference. On the move all day till it ends around 6. Starving. Time to Yelp up a good place to eat in this town and map my way there. Oh wait.
God help you if you took pictures or used your map application much during the actual course of the day.
The day smartphones can allow a user to use every core application heavily (maps, email, voice, camera) all day from the time they leave their bed in the morning till the time they return to it will be a great day imho. It isn't every day that you're travelling for business, but it's these users and these situations that feel the pain points of battery life the most. It happens to millions of people all the time, every day.
I think you missed the jab the parent post took at the grandparent post.
Just because you don't think you need x amount of hours of battery doesn't make it useless for everyone else.
Also, people who question why do you need more? Because you can do more things. Our usage of smartphones is increasing in many ways and improved battery life should not be counted in terms of how many hours of talktime it will give you, but how many hours of <insert heavy battery eating application here> use it will give you.
