For a great craftsman, I expect them to get something out of any tool that a lesser person could accomplish. They can make a good tool do things I wouldn't think of, but can also work around the limitations of a lesser tool.

So if you couldn't get anything out of a better tool, I'd start asking uncomfortable questions about you.

Do I think I as a developer could leverage a Mac Pro to speed up my code-build-test cycle? If the whole team had them, then I'd absolutely tune our tools to use the extra cores, monitors, etc. We are better at troubleshooting when the feedback loop is shorter.

But to me the Mac Pro is more of a tool for designers. If a designer is turning in the same work on a 1k machine I would ask about our process first, the designer second, and the tool third.