Fellas, to each their own...yes, internal routing of the cabling and hoses up through the headset and in the handlebar takes a little extra time to set up and adjust than if the hoses and cables are exposed in those places. But, how often is someone fiddling with the brake hoses and wires up around the cockpit? Of the things about bikes that frustrate me...wait, there's nothing about bikes that frustrate me.
I say this is really much ado about nothing.
eduskator, get the BMC if it inspires something in you. The bike looks fast, and it'll be a joy to ride. That's all the rationale you need!