Most of the additional resource requirements likely are related to faster and better multitasking. Again, as the hardware becomes more capable, Apple in turn pushes it harder and demands more of it. As with any company and device. No point in have increasingly faster and better processor, graphics, and memory if you only need it do what the 2008 model phone could accomplish, right? The phones simply don't need to be as streamlined with just basic functionality anymore. People are using them to do lots of different things now and Apple has ramped up the OS to be able to easily handle not only performing those tasks, but newer, more demanding application, as well as switching back and forth between them quickly and easily.
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