Subtype theory is foolish because there are a million derivatives of each type, not just two. All it is is that people have varying levels of use of each function, but to try and systematize it and say that "higher thinking equals lower sensing" or whatever, I'm starting to realize is pretty much a joke. Even our acronyms don't mean everything about the strength of functions. It's only a really simplistic (and maybe even improper) way of organizing the use of functions.