Yes, typing speed, when looked at in isolation, does not cause the production of high-quality code. But there is an argument to be made for reducing the friction between one's mind and the code on the screen. Insofar as we can ignore that transference of data from biology to technology, we can think more fully and clearly. So, emacs commands that are fully ingrained in one's subconscious may be good, but probably not the C-u 12 C-x TAB; at least for somebody simple like me.