What's the point with that quite lackluster story in Endwalker?

[Reinha]

I would put forth even if the Ancients were about to make a horrible mistake, they still had the right to MAKE that mistake. FFXIV is a game that puts forth the idea that as long as you don't give up, you can atone for horrible things.

Venat was an Ancient like the rest of them. When you have power like that, every decision affects the fate of others. It took only one depressed Ancient to almost destroy the entire universe. If a bunch of Ancients had the right to sacrifice a bunch of unborn, unwilling lives to Zodiark, Venat also had the right to do what she did.