Apple's iOS software design strategy is interesting, to say the least. For example, many people wonder why it took the company nearly a year to implement the App Store after launching the iPhone. It took another year after that to add copy/paste and picture messaging features.
Apple excluded unnecessary items in early builds of iOS, demonstrating a quality-over-quantity sort of approach to adding new features. Luckily, iOS 5 seems to be finally bringing many of those omitted functions to the iPhone. Who's been dying to change the email tone?