A curious bit from Wikipedia: In discussing the origins of vi and why he discontinued development, Joy said: I wish we hadn't used all the keys on the keyboar

A curious bit from Wikipedia: In discussing the origins of vi and why he discontinued development, Joy said: I wish we hadn't used all the keys on the keyboard. I think one of the interesting things is that vi is really a mode-based editor. I think as mode-based editors go, it's pretty good. One of the good things about EMACS, though, is its programmability and the modelessness. Those are two ideas which never occurred to me.