My gripe with Warriors of Darkness for example is they had the makings of making a Divine Might style content setup because not only are they technically a reflection of "you" but they WERE "you" in XIV 1.0, which is the world they're from, essentially when you look between the lines (haven't read the NA lore book yet though.)
Isn't it pretty well established that the Eorzea of today is just the Eorzea of 1.0 but after some time has passed? Including how Dalamud is now in the ground and has Bahamut in it? There's nothing I've seen to indicate it's some kind of different world. Also the WoD said their world was destroyed by light. Not exactly how I'd have described the calamity.
It depends actually, since the binding coil storyline is what technically wraps up 1.x - but it was also "optional" in order to not force people who join specifically at 2.x to go through content they didn't want to, so in terms of canon storyline, it depends if "you" are a legacy warrior of light or not.
But then again, I don't do the storyline in English so I haven't read/heard some of the differences/exclusion to the dialog (the Japanese one is very straight to the point at times or have a few points or were retconned after 2.2 for example when certain soldiers in the garlean army claim to have come from areas only found in Ivalice.)
Whenever they got asked about the binding coil storyline, it always teetered between being canon and not canon. 2.0 is supposedly 5 years after the calamity, but there's no closure or explanation to that unless you do Binding Coil (basically unless your character goes through it) which is why people sort of had an issue with Ali being reintroduced into the story and the differences in dialogue you'll have based on that if it'll be plot changing or not but it ended up not being too major. The reason I say that is because at least in original Japanese interviews, Yoshida has always said the derplander and crew represents us (players) and they end up being the warriors of dark, so they're technically our reflection, but again I didn't read the english lore book, so there may be some differences, like the book's japanese release had character profiles setup differently.