>> Pro is more likely to be defined as something particular/peculiar that you do not find on other usual/consumer/widespread brands and accomodates very particular use-cases.

FWIW, Dell, HP and other vendors use the term "workstation" to cover what you're talking about.

IIRC, Schiller did use "workstation" in the keynote when he talked about connecting the MBP to two external 5K monitors, but in general, the meaning of "Pro" is so diluted (esp compared to "workstation") that it means different things to different people.