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I think it's typically a case of desperate times call for desperate measures.
i love how there's the genre of fix-it fic where the author goes into great granular detail of how our heroes manage to avoid or undo whatever character death or other unpopular choice occurred, in a way that abides by the laws of the fictional universe and definitely required a substantial plot outline, and then there are fix-it fics where the author just went "that's bullshit and didn't happen," and we as readers all go "agreed. carry on."