Agreed. But what I've been hoping to illustrate is that what that looks like...what any one sentient creature is going to do in response to some set of stimuli...is so varied and unpredictable that nearly any response can be justified. Which is why I think any attempt to police actions, or mind-read the intentions of players, or enforce "good roleplaying" with rules, is quixotic.
So, sure, if the GM likes to roll to see if NPCs "succeed at using social skills" (god that phrase makes me vomit, but anyway...) then go ahead, and announce the result, and let the players do with it what they will.
It's the implication that there are "good/correct" and "bad/incorrect" responses to that information that I can't abide.