I don't understand the new Mac Pro

Steve Jobs in 2003: 

Design is not just what it looks like and feels like. Design is how it works.

The essence of this message was reiterated a number of times in Apple's WWDC keynote yesterday and has somewhat become a design truism. 

Everyone knows that design doesn't just mean visual design or appearance.

So why is the new Mac Pro a small tightly packed cylinder?

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What happened to form following function?

Virtually every single Mac Pro that's purchased for professional use will have to have external storage attached. External storage that will require an expensive Thunderbolt 2 enclosure (almost certainly costing more than the drives it contains), an external power brick and likely a cheap and noisy fan cooling system.

Apple are geniuses at industrial design and it's always fun to show off what you're best at, but I can't help but feel that this was absolutely the wrong arena for this type of hardware package design grandstanding.