Neither ken nor dmr were impressive typists. In fact few programmers were then, at least of my acquaintance.
In the 1970s Bell Labs created the Getset - think of it as an early wired smartphone, or a Minitel, with a little screen and keyboard. It cost quite a bit but was a cool gadget so the executives all got one. But, in fascinating contrast to the Blackberry a generation later, no one would touch it - literally - because it had a keyboard, and keyboards were for (female) secretaries, not (male) executives. The product, although well ahead of its time, was a complete failure due to the cultural bias then.
There may be a good sociology paper in there somewhere.
I'm not saying K&D shared this blinkered view, not at all, just that typing skills were not de facto back then. Some of the folks were even two-finger jabbers. I was a little younger and a faster typist than most of the others, and I am not a good typist by any modern standard.
bwk was one who could smash out the text faster than many. His having learned on a teletype, the keyboard would resound with the impact of his forceful keystrokes.
-rob