Silly, I will take a poke here, but if the convo gets much longer we should diverge to the enfp common issues thread as to not divert the topic too much.
With Fi....be very, very careful as it is exceptionally individualistic in nature. I have yet to hear anyone try to give a good account of how Fi matures. I suspect Fi is an amazingly complex mirroring function. You feed it external data, it mirrors that data, thus prompting the Fi user to physiologicaly mimic what they see. If that stimuli is painful, then the response is one of pain and the stimuli becomes associated with "bad". A stimuli that is pleasent brings internal happiness, thus gets labeled as good. Ne allows us to connect and amplify these incoming stimuli or perceive more than what we actually see. Everyday of our lives we are sorting and cataloging these stimuli sensations into an Si library of "good" and "bad" that we use to judge incoming new stimuli against. (I utterly loved your Si description btw. Totally awesome.)
Eventually we have cataloged enough data that we start using the FiSi library to make choices/judgments. The INFPs and even some enfps will describe a sensation of actually measuring their own internal Fi against an external object-like it can be compared fairly objectively? Many of us, just have gut feelings-like a pinch in the gut or almost a stomach cramp or internal angst.
But be very very careful about saying who does or does not use Fi as, due to the endless individuality, it can come in very diverse flavors. Since it is internal, you may see very little of it externally but that does not mean that deep seated values do not guide the ship.
NeTe is for play - just in isolation, it is like solving a puzzle. Sometimes however their is a very real Fi need to solve a puzzle...thus Fi determines the orientation of the ship-but then to be able to step away from certain aspects of Fi as they will prevent an objective evaluation of the problem. (Fe does the same thing...note Sim attacking the INTJs in the thread. They offend him morally and this offense introduces flaws in his logical analysis)
Fi is exceptionally complicated so it is almost like taking certain aspects and turning them off, while still tuning into other aspects. Solving a technical problem for me is like flying at 30,000 feet over the problem and finding a "lump". I turn off the values part of Fi that would make me offended, (or rather dismiss the offense as soon as I note it), but I maintain that ability to mirror the problem. Once I find the lump I tend to hand it off to an NT to resolve, but sometimes it is a very complicated people-hardware-software lump. But the lumps always stick out at me as being terribly obvious. In the same way people systems are terrible obvious to structure and understand. They are just flow charts of functions. Sim is right, in that you really can predict behaviors based upon type and function. Honestly it kinda bores me after awhile, so I have to remember to look at Fi as well to make people interesting again, otherwise I already know what they are going to do, before they do it.
Sometimes this is bad as you know that no amount of coaching or communication can fix a particular combination of types in a combination of positions. Some older ENFPs tend to grow in Te quietly under Fi and will fire people in these circumstances. Its scary as they can seem so very nice, yet pat you on your back as they walk you to your car. They scare the shit out of people.
Um...so Fi, one last thought on this wall o' text...Fi in enfps isnt meant to be Fi in INFPs. If INFPs externalized every Fi value they have, people would avoid them. But ENFPs are meant to externalize to a certain extent, so our values remain much more flexible, open ended. I note that you and Satine have the most resolution in Fi values of ENFPs on the board. It is beautiful, but it may serve to lock you onto a certain path at times...I dunno...Jung said we have to get to know our shadows and understand they are part of us...
I dont understand if this meant understand them so we can ignore them or undersatdn so we can develop them and become more whole. So I choose the second, and am trying to reach Fe and learn to really use it....But it means stepping away from Fi...giving up that intense need for authenticity...the trick is that if the reason for working in the Fe "mindspace" is Fi motivated-like love for another...since my Fi values are so simplistic...kinda childlike, yet very intense...it is perfectly okay to step away from Fi into Fe since I am still being true to Fi values? Yeah it is really weird but gives me a new way to love others and meet their needs-needs I couldnt meet before...but means letting go of Fi just a bit...
I dunno. (This is like 4 pages of text...)