VIM started flirting with giving me RSI issues (mostly : and esc keys; yes, even on capslock. I have small hands) after some years. It's a comparison certainly but not a control.
With a modern firmware or maybe software you can map capslock to be escape when tapped and control when held. I hear this is nice for vi, and it’s also nice for emacs since escape can serve as meta.
I’m going to try that with the key left of space, since it feels completely obvious that the thumb is the natural best finger for modifier keys.
I've been using this for years and can say it's very nice.
Caps2esc under Wayland and I think I used to use xcape under x11 though it's been a while. (caps2esc has a configurable framework so you can use that for a different key and it should work nicely for you)
As a heavy VIM user, that combo never made sense to me. ESC is a single pinky or other finger (I personally move my entire left hand forward and out from the elbow, and press ESC with my middle finger). Using Ctrl-[ requires using _two_ weak pinkies.
