> Well, that’s in the eye of the beholder. […]
I would say it is not.
Usability testing is a thing, and products can get better and worse scores when trying to do the same task / reach the same result. I'm not aware of any published studies on the topic, but I would not be surprised if Git got lower scores than Hg on UI/UX, even though they can basically do the same thing (distributed development).
Given the GP trained people on multiple version control systems, including another distributed one (hg), and people mostly had a problem with Git, I would say Git is the problem.