The only thing that was effective for my RSI — and was really effective — is an app that forces me to stop typing for 15 seconds every 4 minutes. Super irritating but it works. AntiRSI on a Mac, Workrave on Windows and Linux, are examples of ones I’ve used. Been doing this for 20-odd years at this point.
Switching to Vim cured my RSI completely. I was thinking that coding might no longer be my occupation, but thanks to Vim I’m still working 10+ years later!
Maybe your keyboard was a contributing factor? I had wrist pain typing in vim on a "regular" (Keychron C1) Keyboard. The wrist pain is gone since i use a split keyboard (Ergodox EZ) which allows me to rotate both halves of the keyboard in order to match the "incoming angle" of my forearm which removes the need to constantly bend my wrists outwards.
It was indeed, and I went through an incredible range of bizarre alternative keyboards (vertical keyboards, DataHands, etc), but the simple fix ended up being the timer apps mentioned, along with a very standard MS ergonomic keyboard.
