Not toooo long ago, VERY few peeps could type (especially males).
That has been changed dramatically by computers.
I had some experience writing progs on old computers and using them for my life-long hobby.
Then I had a long time live in girly friend who had done a business degree and was a typing teacher. This quickly moved on to word processors and then computers. She was VERY good (and with a keyboard).
She told me that a good sign of improvement was operators making single-pair letters reversals. I.e. adn for and teh for the.
Recently I seem to be doing it all the time.