Ti Ne Si Fe
Te Ni Se Fi
Fi is "one shift" from Ti: T -> F
Fe is "two shifts" from Ti: T -> F, e -> i
essentially, i suspect most of us will consciously associate with our daemon/8th function (Fi in INTPs) more readily because it is more similar to our dominant function (Ti), but we consistently rely on the aspirational/4th function (Fe) in actual processing. our preference - which one we actually rely on more in our cognitive processing - is not necessarily conscious
i would suggest to INTPs who tend to score high on Fi to check out the Fe/Fi threads, and see what you guys tend to agree with more readily. from my experience in those threads, the IxTPs often end up disagreeing strongly with Fi users while more easily seeing things from the Fe perspective. this suggests to me that a similar phenomenon is taking place as with my Si/Se - of the recognition of Fi being more "alike" to Ti than Fe, and therefore INTPs more easily associating with it, but it not actually being the preferred judgment method.
so not to say that an INTP couldn't have skill or experience using Fi, or even feel more comfortable with the idea of Fi than that of Fe - i think they certainly could - but i think it's going to be extremely difficult, if not theoretically impossible, to find an INTP who actually engages more Fi than Fe - because theoretically Te will accompany Fi and Fe will leave with Ti, making that INTP an INFP.
nah, still INTP. they probably just utilize more Fe in everyday processing than they consciously realize.
i think you're going to be very hard-pressed to find an ENFP who uses more Fe than Fi, if only because the way Ne works makes it difficult to use Fe as a primary judgment system. JePi users you guys probably understand what i mean - when you're surfing Ne or Se information, it's harder to also engage the kind of judgment Fe or Te requires, because it essentially asks you to "stop" the inflow of external information momentarily. whereas Ti and Fi are internal discerning systems, and can therefore operate in time with continued perusal of external information.
i've often been identified as an ENFP with "high Fe", but when i discuss with real Fe users in the forums, it becomes clear that our modes of processing and baseline assumptions are very different. they just happen to end us up at the same places, probably because the reactivity of Ne plus the people-attention of Fi can create a decent simulacrum of Fe.