The Reasoning behind The Sundering? (*6.0 Endwalker Spoilers*)

[KageTokage]

We still don't even know if Zodiark could've actually brought back those who were sacrificed as true resurrection has repeatedly been shown as something out of reach of man and the cycle of life and death something that cannot be reversed, so sacrificing countless lives in the name of possible benefit, especially if those lives were sentient beings like the beast tribes comes across as...questionable.

The sudden shift in the Ancients' attitude of finding death in service to the star acceptable to something terrible that needed to be undone comes across to me as a likely product of Zodiark's tempering them with the selfsame desire he was summoned with; to return the world to the way it once was.