Well, you knew someone was going to say it eventually. Why are Sensors divided on P/J while Intuitive types aren't? My answer is that they should be.
The T/F divide is based on the flawed assumption that the judgment functions create the most significant division between the way different Intuitive types process reality, and I haven't found this to be the case. The two biggest dividers tend to be Ti/Fe vs. Fi/Te, or J vs. P, IME.
I've never seen straight T/F conflict coming into a situation unless it was an ENTJ vs. an INFP, or an ENFJ vs. an INTP, and that can hardly be temperament defining.
Also, the way the temperaments are currently defined places a connotation of intelligence and academic traits on NTs that may not be deserved, and a connotation of humanitarianism, idealism, and self-sacrifice on NFs that may be equally undeserved. In reality, I've seen little that indicates that this concept is justified.
You can, however, observe how NJs take similar strategic approaches to life, regardless of whether they apply this to the sphere of people, or the academic/intellectual sphere. You can also (even more easily) observe the similar spontaneous, innovative approach NPs take to life, regardless of whether they're NFPs or NTPs.
My opinion is that this new arrangement would more accurately reflect the approaches different types of Intuitive types tend to take towards life, while leaving the obvious potential for them to develop in more directions than NT and NF imply.
So, what do you think? Do you like NF and NT the way they are, or would you prefer my proposed rearrangement?
(Note that this thread has probably been done several times before, so I've just placed in the fluff zone, as I don't expect it to be taken seriously).