"But by listing those professions, you also implied that those same professions would be interested in an iMac Pro precisely for the reason that they would not have to upgrade or tinker with it."
Wrong. Again... I made no such implication. That's on you not carefully reading what I wrote.
I made a specific response to a poster, in post# 199, who was talking about his MacBook Pro that he upgraded, where I made a general characterization about professionals, rather than tech enthusiasts, not tinkering/upgrading their computers, and then listing a wide variety of professionals who use computers in the course of their work. That characterization has absolutely nothing to do with a iMac Pro, or any other computer.
Once more, the characterization is about people, specifically professionals, and not about specific computers. Surely you know that some professionals might use a MacBook Air, a MacBook, a MacBook Pro, an iMac, an (i)MacPro, or even an iPad in the course of their work. It's about using the right tool, of which there are many. None of which are upgradeable, with the exception of a few very narrow cases (iMac 27" and MacPro).
You created a straw-man, in an attempt to create a "gotcha" you could respond to. And now are unwilling to own it.