I'm sorry, this isn't analysis grounded in actual play. I don't know why it matters to you to have these presciptive definitions for things.
Firstly, no - there's no such tenet. My group frequently plays Apocalypse World and one way I get the players to take insane risks and do ridiculous dramatic stuff is to remind them that the audience wants to see that stuff. Don't turtle, if you're gonna do it, do it. That can be totally viewed through the lens of 'creating the best story' - but it's still the character being played totally hardball.
I've seen - and done - the same in the Fiasco; played characters with an insane recklessness - not to advocate for them except in the sense that we're going to see something crash and burn.
And in Fiasco you don't get a say in how your scene turns out. So there is nothing to do but to play hard - irrespective of whether that is into your sense of character, or into your sense of drama, or both.
This is all Story Now play. In the moment, based on thematic concerns, unscripted, happening now.
I'm really only interested in actual play examples from here on in. I don't think the white room theorising is doing any work.
Tell me about the times you played Fiasco.