I decided last night to commence creating a taxonomy of all the types because I came up with what I think is a nifty part classification for INTs:
If we understand there to exist a spectrum of analytical focus, at the one end the seeking for the truth of all things and at the other the seeking for the connection between all things, then INTPs and INTJs are both analysts. Ji/Pe seeks for the truth of all things in their area of interest while Pi/Je seeks for the connections between all things in their area of interest.
Given time and the same area of interest both kinds of analysts will end up overlapping. They won't write the same kind of research paper but in due course they will discover the same content. (They will also as they near the end of exhaustive discussion be exhausted because they'll be moving into each others field of cognitive expertise and exiting their own.)
(Possibly this kind of description lets all IPs and IJs be considered analysts, naturally with significantly differing fields of interest.)
(And I don't know what to call the extroverts on this scheme. Perhaps "creators", with Pe/Ji inventing and Je/Pi constructing.)
Anyhoo, it's worth observing that the judgment function needs its perception buddy and vice versa. One or the other, the perception function or the judgment, will be (technically) shallow and the other will be deep. Particularly for the introverts, it's the e function that's (technically) shallow and the i deep. Which is okay, I think, because the i function lends depth to the e, and the e lends reality to the i. The e function is relatively shallow inasmuch as it accepts what's out there!
This is interesting to me, this idea that there are relatively shallow functions, and that they are needed mostly to avoid insanity. There has to be a function that takes the world as real and doesn't question it that much, or else none of us would be a part of this world. We'd all be so out of touch we would never have been born.
Rock on shallow attachment!
(For the extroverts, they use that e function much more, so it gains some depth, there being so much "out there" that focusing out there can't help but become deeper(?). Sorry guys.)