"I think we designed ourselves into a bit of a thermal corner..." "Specifically, as mentioned a bit above, it was the unique triangular design of the Mac Pro’s thermal core that proved to be the limiting factor. Because it was designed to carry roughly balanced loads of heat on all three sides, it just wasn’t equipped to take on the task of supporting the now incredibly popular single massively powerful GPU configuration. Simply put, it wasn’t built for one of the three sides of the triangle to get super hot." “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. https://techcrunch.com/2017/04/04/apple-pushes-the-reset-button-on-the-mac-pro/ Schiller, “And if we’ve had a pause in upgrades and updates on that, we’re sorry for that — what happened with the Mac Pro, and we’re going to come out with something great to replace it. And that’s our intention,” he says, in as clear a mea culpa as I can ever remember from Apple."