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…
Like you, I've been blessed with never having any hint of RSI.
I'm not necessarily disagreeing with you, but I think the whole 'RSI landscape' is, as with most things, very complex, including a lot of poorly understood or currently unknown factors.