Fi is overarching but not overarching at the same time, so I think this quote is too narrow in scope and bias towards Fi due to its illusive nature. Fe is just as selective as Fi, but since most people accept that Fe is better understood, Fi then becomes more selective somehow since it is less understood. I firmly believe that for every introverted function their is an equal and opposite extroverted function capable of similar levels of discernment.
I think Fe is much more discerning,
albeit initially, than Fi. Fe will use a sort of weeding in or weeding out process to cast out those who don't make their cut. Fe will have a hard bottom line or benchmark while Fi will have ethical qualifications that need to be met in order to check off their list. (If you make the Fe cut, you're in. If you make the Fi list, you're in.)
Fi will be able to love or not love through good times and bad times as their subjective, introverted feelings about someone solidify and become unwavering, and it is this attribute combined with historical introverted intuition that denotes ESIs as loyalists. However, ESIs can be exploited through Se, as it can be an insatiable function, so the easiest way to win over an ESI is through a consistent supply of quality Se - ESIs are like
LSIs in this way. Same goes for winning over an ILI, but quality is much more important than quantity at this point in the functional cascade (
FiSeNiTe vs NiTe
FiSe). Thus, LIEs are like ILIs but with a slightly greater emphasis on quantity (TeNi
SeFi) rather than quality.
Fi
Fe