Luckily, there's a whole Wikipedia
article! Though, again, most people just skip right over learning what the concept is and assume "retcon"
always means "we're ignoring past information to add new information that directly contradicts old information" (subtraction retcon). In that light, FFXIV would rely
heavily on "reframing" (addition retcon) or "new revelations" (alteration retcon).
Let's face it, the only way you're going to get through a 10+ year game is to have some wiggle room, and if you
hate subtraction retcons (and the dev. team do), your only option is to rely on being vague where you can get away with it
(so you can re-frame for new possibilities) and having information vectors that make mistakes (
Dumb NPCs). Can't write all 10+ years ahead of time.
Any writing that's done
recently that changes writing done
previously,
after the fact, in a way that wasn't
intended at the time is
continiuity ...
retroactively. Even if it doesn't have any contradictions, but merely
explains or adds new significance that wasn't intended from the beginning, it's still
technically a retcon.
It's just that we tend to see only one subtype of it as plot poison. But if we're going to debate, we might as well be using the same operational definitions, yes? lol