I certainly wasn't saying Fi was just airy-fairy stuff. In a preferred position (FP), it may come off that way in stereotypical behavior at times, but in my theory, since the Supine and Sanguine temperaments are largely FP types, then the inferior or tertiary Te will be lead to them being easily motivated by and led to adopt these Te principles, hence, a higher level of "responsiveness" (compliance, basically; where normally, they are not really predisposed to those sort of leadership behaviors on their own).
I certainly believe the corporate executives do this, because I grew up around Te, and while my parents may not have been persistent with it as the executives, it clearly was how they thought when attempting some sort of self-motivation.
(I'm sure there are many ETP executives, and I'm not sure what their method would be. Whether they would just go along with it, because it seems so universal, or whatever. I imagine the ENTP would be likely to come up with some unique alternative).
What happens, is because it "works" for them, they believe it's universal "truth", and then charge at everyone else with this as the "right" was to go, no excuses; don't allow for other factors (including personality type) to affect things, etc.
I was going to add, that what's most bothered me, is that they essentially tell you how to feel. Like when they start talking about "attitude", dealing with frustrations, difficulty is good, "take heart; God is in control"; all these memes you see daily on the social media wall. (Again, both secular and religious). My brother was even mimicking the "process" he was telling me to embark on (self-forgiveness), by signing, breathing in lightly beating the chest, and saying whatever you're supposed to say to yourself. (He even surpassed our father, who always used to say stuff like "just swallow it", or "just tell yourself..."). All of this just drives me up the wall. It's like, damn; you should just put a puppet or robot in my place, and pull the string or program it how to respond to life!
I realized this was a reaction to Fi (when I've always preferred affirmation from others. Not knowing about type years ago, I went to them, and only got the Te/Fi method, proclaimed as THE way). I should mention, it's not that we can never "countenance" shadow functions on others, as it's sometimes been made to seem. It's just that in certain situations like that (I imagine, especially when in a very vulnerable "inferior grip" due to some stressful state), where it itself is coming at you in a more "primitive" form to begin with, and it's going SO against ego's perspective, that it just has such a toxic feeling.
Fi is ultimately about "personal(F) identifcation(i)", which then goes into the "self-definition" you mentioned.
In a more "mature" state, it says "If that were me, I would feel this way. So let me respond to the person's needs as I would want to be responded to" [assuming this indicates universal need].
Hence, the more compassionate stance FP's are more known for.
In a less mature position, especially where it's supporting a preferred Te; it becomes "If that were me, I would feel [and respond] this way. So then you should feel this way, and respond this way too". [Again, presumed to be universal, and then the person not getting with the program is deemed ignorant for rejecting this "help"]. Hence, the "directive", "structure-focused" posture of TJ's.
Fe on the other hand, if "he says he feels this way, or I can see that he feels this way, so let me address his needs". Both Feeling attitudes then become equally "empathetic". Immature tertiary or inferior Fe is similar, but not as proactive in addressing the needs, or tries to do it through an internal logicalal method which may or may not help the person.
This is what happens with all this motivational speaking and counsel often given.
(BTW, as far as Mother Theresa, I think she's usually assumed to be FJ, though I've seen INFP as well. In APS, she's usually held as the perennial Supine, and both IxFP and IxFJ will likely have some Supine. Again, it can be hard to tell, since both Feeling attitudes cand do the same things).