Reddit mentions of Conscious Orientation: A Study of Personality Types in Relation to Neurosis and Psychosis (International Library of Psychology)

Meyers-Briggs say that only Jacobi and van der Hoop "got it". She was refering to van der Hoop's Conscious Orientation which explains how the functions work.

At its most basic level, Thinking decides if something is true or false. That is, if it exists. It is a binary function by definition.

Feeling uses the subject's subjective values to compare one thing against another, deciding if it is greater than, less than, or equal to the other. That is, it is a comparative function. It is trinary by definition.

Feeling follows Thinking. That is, first you decide that something exists, then you compare to other things that exist. They are both judgements, but each are of a different nature.

Feeling is more complex than Thinking, because it has a third option that Thinkers are not used to. Otoh, Thinking is more consistent than Feeling, for the very same reason.

Thus, Meyers explains that Thinkers are afraid of Feeling because they are unskilled at it. Also, when they try to use it, they find it too hard with that extra option. (Compare this to boys who use cursive less than girls because they are taught it about a year too early, never get good at it, and go back to non-cursive. Girls, whose motor skills mature faster than boys, are fine with it, get good at it, and tend to use it more.)

Feelers can Think if they want to, she continues, but they find Thinking too cold, and simply do not want to do it.

So, Thinkers end up with a poorly matured Feeling function, and project their inferiority at Feeling on Feelers. Conversely, Feelers end up with a poorly matured Thinking function, and project their inferiority on Thinkers.

The why and the worth are both judgements, and both Thinking and Feeling can do both, even if the other is "better suited" for it.