Interesting article. I accept that the seeming overstatement of "about two years ... [to] be proficient" differs case by case and may be an average or worst case scenario. Still, the next argument that "The argument that Vim is more efficient is dubious and untestable" because "developers are commonly on machines where the trackpad is a micro-hand movement away" seems to miss the critical point that moving away from the keyboard tends to break trains of thought, at least for me and other programmers I know. This is critical because it takes a while to load problems and solutions into your head. It's like building a house of cards. Looking for the mouse cursor slows down that building tremendously.