Let us just say: There are a couple different notions at play here.
One is your argument about how people actually work. This is the classic realism argument for justifying this notion of "flawed" characters. This is a perfectly valid concern to bring in when writing a story. Many want to read about realistic characters doing realistic things which includes a realistic dose of irrational actions. I just happen to not be one of them. And hence it is the notion that irrationality should be on the table for it to be a "good story" at all I am strongly against (even if softly described as just "being hard"). This mentality might be good for crafting a good story for some, but it is a recipe for breaking an otherwise good story for me.
Okay. But if it is a classic realism argument...
And
numerous people in this thread are making realism arguments (often substituting other words which are, themselves, an attempt to avoid saying "realism" while still really just being realism in a trenchcoat) about their characters...
Where does that leave us?
The other is the notion of "most rational, pragmatic decision possible". This was as a reply to and contrasted to "make sense". There is a huge gap between your ultra genius autist and someone being sufficiently rational and pragmatic to only do things that "make sense". My objection was based on my understanding of the spirit of the entire quote I made, not to an extreme interpretation of the last sentence alone.
Bur you yourself continued that precise argument! You demanded that characters never be swayed by emotion, never have a lapse of judgment, never think something is more or less important than a dry accounting of the facts would indicate. That's what you argued: "conflict between characters that do exclusively perfectly rational and pragmatic decissions [sic]
given their set of values, and limited information." (Emphasis in original.)
In other words: I do not see anything I disagree with in your post, beyond possibly some minor nit-pic I do not think is relevant to bring up.
Then I guess I don't understand what you mean by "do[ing] exclusively perfectly rational and pragmatic decisions", whatever limits one places thereon. Humans
suck at being rational decision-machines. Huge swathes of human history have been defined by foolish choices. Hell, I have
personally been responsible for damage and harm caused because I failed to rationally think through a decision and how it could affect others, how it could have consequences I would never willingly inflict. One such decision, I was
extremely lucky that I did not literally kill or maim my younger sibling, and I was paying (mostly in labor but also in financial restitution from time to time) for that foolish decision for YEARS after I made it. It eventually got to the point where I demanded an end to the (effective) reparations, because I felt a decision I'd made more than a decade earlier when I wasn't even an adult yet, and which I had done
repeated back-breaking labor to address, should not continue to haunt me for the rest of my life.
Besides that? Consider Venus getting sloppy drunk at a wedding party and imprisoning her son long after he had forgiven Psyche for her distrust and betrayal. Consider the absolute, unmitigated
pettiness of Achilles in his tent while the Greeks are out there being slaughtered by the Trojans simply because somebody took his newest female conquest away. Or Set killing his brother Osiris (in public, mind, so everyone knew who did it) to usurp the throne. Or the myth of Midas, who asked for a wish that even a young child could see would end in tragedy. Or if we reach back all the way to the oldest work of literature known to mankind, to the many,
many stupid and reckless things Gilgamesh does both before and after he meets Enkidu. "Otherwise smart/powerful/successful person has a horrendous lapse of judgment/does something profoundly stupid" is literally as old as literature itself.
Given I have lived this experience, and it is found woven through tales as old as
writing itself, I'm not sure what I should make of the suggestion that the "great works" of literature are so full of exclusively rational people making only the best, most pragmatic, most logical choices, even when filtered through their values systems and degree of informed-ness.