That is a great video, and nothing here is meant as criticism of it. After all, it is meant to be brief.
It always bothers me a bit, though, when the fact that there was user friendly software before the windows/mouse GUI gets glossed over. The GUI was undeniably a big paradigm shift. (Being graphical by default, discouraging modes, being more event-driven, being more consistent, &c.) But there were plenty of people who wanted to—and did—make computers more accessible before it.