I've been typing for 36 years now (since I was a child), and have never had RSI once, or anything close to it. I think it's because I never learned to touch-type "properly". I use most of my fingers, and I type very fast, but I'm not hitting the "correct" keys with the "correct" fingers - I'm just following whatever comfortable patterns I've burned into muscle memory over all these years. If someone asked me to descr…
It was quite weird filming myself and looking back at it. I never even noticed that I regularly hit Y with my left hand, for example!