I just had a socionics epiphany.
Fe which I describe specifically as
Fe - how to do something and what to do with the surroundings and its individual people and other individual life (emotional directive-organizational subjects).
accomplishes this by creating personas with other people. It molds itself to what they see other people are and adjusts itself according to fill the description I have above.
This explains why Fe egos can have a hard time accepting the baseless and generally incorrect and inconsistent conclusions attributed to the functions and the theoretical relationships - because if you can adjust yourself to the type of the person in front of you, you would be stupid to let anyone tell you otherwise.
And it explains why they would have a hard time determining a type, especially if their personas became pathological to the extent of not realizing a basic instinctive type.
EIE, IEI, SEI, and ESE are probably the types that will overall have the hardest time finding their type because the theory doesn't cater to properly understanding the natures of the subjective functions and instead, as I have seen up until this point, attempts to describe a subjective nature as an objective nature by utilizing an objective lens to do so, which is sensibly impossible.