If I could pick out just one flaw in the Typology theory, this would be the one. While one letter may determine a certain set of tendencies, the whole of the four letter code is much greater than the sum of its parts. I would suggest to anyone who asserts that they are an INFx that they should analyze further, because it is not possible to dodge categorization. An ENTP who has a structured lifestyle is disciplined, not hybrid. The notion of an IxFJ is paradoxical, and one who claims to belong to this type may identify wholly with both of their Si & Ni dominant cousins, but they will either categorize their information in a concrete grid or they won't. I have drawn this conclusion from my observations.
When I first found MBTI, I was puzzled at how the ENTP seemed like me in some ways, but worlds apart in others. I tested ENTP time after time, because my Fi prizes clarity of thought. My Fi feels that in regard to decision making, emotions are a fog at their most benign. On this note, I look a bit different from most of the other ENFP's that I come into contact with, but I would never consider myself an ENxP. This is because Ne by itself is an intelligence devoid of any reality until its "brand" is specified. The Ti version of Ne is a very different animal from the Fi version. Only when I realized that my Ne focused on possibilities to improve myself, rather than to improve conditions, was I able to identify with the ENFP camp. There are some very talkative introverts out there, but that doesn't mean that their psychological focus is not predominantly psychic. I don't work the same as an NT by any means, but I consider rationality and intuition the highest forms of intelligence, so in order to be in line with my own values (which an NF must be), I feel at home when I am behaving rationally. I also consider it the greatest sin to feel that any subjective belief should be applied universally, and any belief of mine that doesn't hold up to an objective external standard is immediately abandoned. Thus, my behavior, dictated by these F sentiments, resembles typical "T" behavior in many ways. (Which is not to say that I look like an ENTP, or any T type in particular.) But I could see how others would think that they are between two types, when they are in fact merely an emotional thinker or a practical intuitionist.
Do you agree or disagree?