I guess what you are saying is: We all have the same access to system 2. Like everyone having access to start a car, everyone needs to put in effort to start

I guess what you are saying is: We all have the same access to system 2. Like everyone having access to start a car, everyone needs to put in effort to start their car, but someone with low intelligence is like someone who has a car that has 10hp... they will go slower than someone who has a car that has 1000hp. Both can start the car equally is what you are saying. Fair enough. I think my point is, below a certain IQ threshold, the HP is virtually 0, and can move little to no distance/speed. Therefore, it's as if it wasn't there. My point is an observation arrived at from the very meanings of the words intelligence/critical thinking, there's really no studies that can 'prove' a word has a meaning. It's simply an agreed upon sound that we associate with concepts. BTW, the degree of what is done is all I ever meant to get at. Look at my very first reply to you. The word 'degree' is central to my answer.