while they did use the phrase 'perfectly rational' i think you've fixated too much on the dictionary meaning of perfect (flawless) rather than the conversational use (very well), i believe you've seemed to of done similar in this thread a few times where you've taken things to the extreme end of the scale expecting complete total adherence to a concept rather than allowing for nuance.
I would take this more seriously if the rest of the context did not imply otherwise. Such as the word "exclusively", or the fact that TwoSix had specifically said, "It's hard to create an interesting story around a character who always makes the most rational, pragmatic decision possible." That was the specific thing to which Enrahim objected, and found it execrable enough to speak from a place of emotions rather than calmly.
The context--very clearly--was one of "always" and "most". That makes the phrase "exclusively perfectly" an
extremely bad choice, if their intention was "mostly very adequate", whether or not we factor in the values-system/imperfect-informedness element.
If their intent was in fact "mostly very adequate", then I don't see how they actually have much of an
argument against what TwoSix said. That is, if we're not demanding exclusivity, then we are allowing for there to be times where this rule is broken. Not all the time, I'm sure, but some exceptions occur. Further, even when it isn't an exception, someone might make a
poor choice even if it isn't an outright irrational or unpragmatic one.
I did not, for example, bring up "honor before reason" as a contrast, because that would fit with the stated values-system limit. Sometimes, though, people do things on a lark. Or they act impulsively, without really thinking it through. Or they--as some of us have admittedly done in this thread--act based on a tide of emotion, rather than making a decision in a calm, rational manner, thus doing something that is un-pragmatic. Further, some values-systems are
inherently unpragmatic, whether they be idealistic/naive, dogmatic, cynical/jaded, theoretical/doctrinaire, or sentimental/intuitive, such that there may not be any action which is simultaneously in keeping with a person's values-system and also pragmatic in any meaningful way.