Endwalker Story sucked and it's time to admit it

[Lurina]

And yeah, it might be that all these now-complete people will be used as blood sacrifices to Zodiark if the plan is just to release those souls in Him by way of blood sacrificing other souls. They wouldn't be Ancients though, and the Ascians consider non-Ancient lives inferior for reasons beyond their aetherial thinness (not as physically hardy, susceptible to death by old age, more easily bent toward violence, more openly selfish, etc). A fully recompiled soul wouldn't be enough to save you.

At the end of the day everybody's going to die except for the Ascians, either in the rejoinings, as part of a process to restore sundered Ancients, or as part of a blood sacrifice to Zodiark to get the Ancient souls in him out. The particulars of it don't seem all that important to me.

I'm two days late to this, but as far as I know, at no point is it suggested that the Ascians were planning to sacrifice absolutely-no-exceptions-everyone on the Source to bring back their own kind, or that no extant people would become 'Ancients' upon the rejoinings. During the elevator scene in Kholusia, Emet tells outright you that you have nothing to fear from his plans because upon their realization you would be a 'complete existence in a complete world'. Even if one takes a cynical interpretation of Emet's character where he's sometimes insincere, Alphinaud treats the idea that supporters of the Ascians would be allowed to live in the Unsundered World while only everyone else would be killed as a given during the final confrontation in Amaurot.

And I don't know where this idea that the original personalities of anyone on the Source would be destroyed is restoring them to Ancienthood is coming from. Even when a soul is rejoined, it doesn't seem to cause much of a change in personality, since it happened at the end of 1.0 and nobody even noticed. Identity in FFXIV is based largely on memory, not the nature of the soul.

To be clear, this isn't a defense of the Rejoinings, I'm just trying to nix what feels like a misconception.