This is true, but from what I've seen, not being able to touch type may also be a serious impediment to written communication. Maybe not so much for email, but very much so for anything ~real time like slack/chat.

I once worked (mostly remotely) with a guy who I'm pretty sure couldn't touch type. He wrote pretty dense code and used very abbreviated class/variable/method names. But the real clue came from communicating with him via slack. It often felt like talking to someone much less intelligent than I knew him to be. His messages were so terse that I was constantly having to make a lot of guesses about what he was trying to say. Needless to say, it was not a great working relationship.