Inconsistencies with the sundering (Spoilers)

[Kazhar]

I think what does get overlooked is that the sundering was not executed to stop the Final Days. It was done to stop the sacrifices to Zodiark, and by extension Zodiark himself.

It wasn't done to stop the sacrifices. At least, it wasn't the primary motivation.

Q: Venat had good intentions and her plan worked out in the end, but as a result, the world was sundered and most of the Ancients suffered for it. Was sundering the star really the only way to save it?

A: At the very least, as Y’shtola theorized, Venat believed the Ancients were too dense in aether to control dynamis and stop the Final Days at its source. Perhaps she also believed the Ancients would be unable to change as a people and were doomed to become their own undoing. Therefore, I believe she chose to sunder the star and dilute mankind’s aether, so that someday they might be capable of fighting against despair.

As she said herself, Venat’s actions are not a simple matter of good or evil, and she agonized over it for eons. In a sense, Venat’s very decision to sunder the star makes me think that she too, was an Ancient herself.
Normally, I think it would be impossible for someone to make that kind of choice, but similar to the ways in which Emet-Selch and Hermes evaluated mankind, this was Venat’s way of passing judgment.

Emet-Selch and Elidibus believed the sacrifices were the primary motivation but this isn't what's talked about when we see Venat's followers in patch 5.2. They seemed more concerned with the idea that their civilization was headed to downfall (which is consistent with the above Yoshi-P's quote and Venat's stated motivations during her metaphorical flashback.)