[accordionclown]

this is a really important point.

programs are self-contained entities, whereas prose often drags in multitudes of real-world context involving assumptions, motives, and other considerations.

a diff might inform you of an edit in chapter 2 where you changed a man's status from "divorced" to "widowed" (to make him appear more sympathetic), but it won't also remind you that you need to rewrite that section in chapter 25 where the man gets a phone-call from his former wife.

this type of thing happens a lot, in ways that are much more subtle than that silly example. and it's usually because the arc of the story is greater than (and different from) a simple sum of its pieces.