The 2013 Mac Pro summed up in one picture

We all know that the "base config" just isn't going to have "enough" - everyone needs more hard drive space, almost everyone needs an external drive (burn music CDs, burn DVDs for video), half the people need firewire or HDMI converters, etc.

Mac Pro: $2999

Keyboard $49

Mouse $49

Superdrive $79

4K display (one 32" monitor) $500

Promise Pegasus 4TB $1099 [0]

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$4775

+$400ish in sales tax

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$5,175.00

Jeez. Yikes. Wow.

[0] (you are buying a Thunderbolt-based system so going with a Thunderbolt-based storage system makes sense)

One the one hand, a plug 'n' play architecture is great for expanding the system with new components over time. However, the Mac Pro (and any ATX tower computer) is usually easy to expand with expansion cards. The 2013 Mac Pro is telling me that Apple is playing to the audience that doesn't want (nor need) to know about hardware components, and the only technical expertise is to line up connector A with slot B.