Sorry but this is terrible advice. Freeing your eyes and mind from the keyboard is a great advantage, copying a snippet from a piece of paper is a nightmare if you can't properly type (tiring, error-prone, annoying, etc).

I also find touch typists introduce less typos, because they're looking all the time at the screen and mistakes are noticed immediately.

Also as a Unix/terminal/VIM user, touch typing is a must. VIM is not worth it if one isn't able to touch-type, period.