i really don't think that's the case.. the computer seems designed around heavy processing on two gpus and a cpu.. that's the function in which the form was for-- not the other way around..“We all went on our own emotional journeys, I’d say,” laughs Federighi. “There were periods of denial and acceptance. We all went on that arc.”
Looks like from dictated function.
back then, multi-gpu and GPGPU enhancements seemed right around the corner.. but the direction it appears to have gone is VerY powerful single gpus..
at least according to Federighi in your quotes, the new mac pro simply can't handle one side of the core getting very hot.. they were probably thinking more along the lines of 2 gpus and a cpu collectively generating the same heat/processing power but spreading out to all three sides.. instead, it's currently one gpu generating that much heat/processing and they can't stick one (much less two) of them in nMP..
idk, i think when they designed it, they made sound decisions based around functionality in which the form followed.. but there's risk involved when innovating since you're sort of predicting the future or attempting to shape the future..
in this case, apple took the risk and it hasn't panned out as some (the designers and at least a few customers (such as myself)) had imagined it would earlier in the decade.