That’s why the self reports seem valuable to me. If someone says “I’ve never seen something in my minds eye” and then they do dmt and say “oh shit I can see things in my minds eye now I totally get what people mean now” it seems to imply there’s a spectrum of visualization capabilities. There’s also people who’ve gone in the opposite direction due to injury.
But people who do dmt are also liable to say "oh shit I can see the machine elves, I totally get what people mean now". Which is not to say that their reports are unreliable, just inscrutable.