I was working from the approach that if you removed individuals who used those functions (and, most specifically, those who used them in the dominant position), what would happen to society?
I can see the value of your approach, though.
It is another understandable way to approach the question.
I don't think lacking Se means one can't "react to external concrete details/stimulus/information what-have-you".
I don't think lacking Se means one no longer has sensory perceptions.
Rather, I think of Se as a disposition.
It's a way one orients oneself to the world, specifically with regard to how one prefers to perceive incoming data.
All human beings have sensory perceptions.
Se doms (and heavy users in general) just prefer to deal with incoming data in a more concrete, sensory-oriented way.
That is: they don't like to, or don't have much ability to, absorb the incoming data and see many abstract connections within it.
Hence why I feel that, in many ways, Ne is Se plus abstract connection-making.
(aside: although, I was just thinking about whether the same holds true for Ni and Si, and, at first, I felt that it didn't, as I believe Si does make connections, but, on second thought, maybe these connections are not abstract connections, but concrete connections, and, thus, the same thing can be said for Se, that it makes concrete connections; but, then, that got me thinking on the difference between concreteness and abstractness, which, I am sure, will now be a major question in my thinking over the next couple of days...)
I know your position, and you could stick to your ground there I suppose, but I do believe it's a difficult position to maintain...
Same goes for Ti.
I don't think one need use Ti to be able to ratiocinate.
I just think those who prefer to use Ti more tend to make their decisions based more on ratiocination.
Remember, this is personality theory, not the basis of our entire neurological happenings (unless, of course, you want to make the argument that it is, which, as I said before, I'm open to, but I think is a very difficult position to maintain).