Right. What @Tallmo is describing should be the effect of Normative Fe instead.
Fi polr makes them use broad ideas and "moral philosophy" to deal with stuff. It's not Fi use, even though it might seem like it. They compensate by strong functions. Moral stuff has to be thought out and understood.
ILEs can be very "Fi oriented" thematically speaking. But it's not functional use. It's actually the opposite, avoiding hurting the polr.
That way they can be reliable because there is general thinking behind the moral decisions, not Fi evaluations on a single case.
The decisive thing is not the reality of the object, but the reality of the subjective factor, i.e. the primordial images, which in their totality represent a psychic mirror-world. It is a mirror, however, with the peculiar capacity of representing the present contents of consciousness not in their known and customary form but in a certain sense sub specie aeternitatis, somewhat as a million-year old consciousness might see them.
(Jung on Si)