Its something to do with irrationality and introverted sensing. I see SEI and IEE as sufferin from similar problems, which is fine because there is plenty of overlap, but probably for differing reasons.
Well what you are saying is that I should take your word for it? How do I know you have typed these people you have in mind for your examples correctly? Reinin, for one, describes IEEs as a very cautious type.
"Inasmuch as it is nothing but pure communicability, every face, even the most noble and beautiful, is always suspended on the edge of an abyss"
They asked the fox, "Who's your witness?" The fox said, "My tail!"