Um........ Yeah. iPhone 4, an 3+ years old phone, which usage pattern are beyond what normal ( or called dumbphone) and therefore you charge it a lot more........
And you expect the battery to not died after 3 years of using it? Come on!
And you expect the battery to not died after 3 years of using it? Come on!
On the other hand, if battery degradation after the warranty period is so predictable, then they could have built the phone to take swappable batteries. Otherwise their pretty much guilty as charged of planned obsolescence.
And the swappable batteries, They have their own set of trade off and problems.