The part the author shared about the huge overhead cost of firing up emacs, especially in a multi-user environment (I learned about emacs vs vi holy war back on a multi-user Solaris environment), our Unix professor strongly encouraged us to learn vi. He said "vi is part of every standard Unix install, so when you ssh into a box, you'll always have your editor and it won't steal all the CPU from the other users when you fire it up."

Feels monumental to see that come to an end decades later.