Yeah, you guys need to read those articles above. The viewpoint for an engineer's point of view.
They'll need to deliver high current to future devices. Thus the requirement for their the new dock interface.
When Apple came out with the iPad and it's need to quickly charged it's "huge" battery, many Laptop USB chargers did not output the full USB's spec. However, I had an Apple laptop that was produced before the iPad and it had no problem. Apple had already engineer their USB ports to fully output the max current according to the standard. Which is still low compared to the 2A charge rate the iPad's dedicated AC adapter can deliver.
Nowadays, all laptop comes with the ability to charge at the max current via their USB ports.
But for me, real worlds day to day usage...the reversibility factor is high up there. I've always thought many of the new standards overlook the need to be able to plug a connector in without having to see how it's keyed. You'd think it's only a 50/50 chance, but there's been some frustrating moments where neither side seem to go in when plugging in a USB cable. Then out of frustration, have to look at it to see how the pins are keyed. It gets worst when having to plug into the back of a desktop computer underneath your desk.
So for me, the reversibility of it is very important. It's the 1 thing that I encounter many times a day as I get in and out of the car, plugging in that charge cable each time.
Lastly, one tidbit that possibly only a designer or Apple fans can appreciate. It's the symmetry of the design. Function and form. Nice.
The Chinese manufacturers will soon create knock offs and it'll flood the market just like the original 30pin. And despite it's proprietary nature, every family member's house or friends I know usually have one laying around.
All that said, it would have been nice for Apple to ease the transition with a free adapter in all their latest devices. And it would have been good if it was USB 3.0 from the get go.