Endwalker's story had me, but lost me. Ethical issues especially (spoilers)

[Cleretic]

Well, for all intents and purposes she was supporting the instigator of the apocalypse (Hermes) with her inaction. He himself says that if the others retained their memories they would have the advantage and it wouldn't be a "fair" contest, so Venat not telling anyone or doing anything was just going along with his plan. If it had just been a branching timeline or she too had lost her memories this wouldn't even be an issue.

But also that him retaining his memories would give them an unfair disadvantage, which is actually a more important factor because Hermes is the only guy in a position of power equipped to know what's going on when he sees it.

Venat needs to keep the information secret enough that Hermes doesn't learn this is his fault, because if he does he'll either switch sides or drop out entirely.

[Veloran]

But also that him retaining his memories would give them an unfair disadvantage, which is actually a more important factor because Hermes is the only guy in a position of power equipped to know what's going on when he sees it.

Venat needs to keep the information secret enough that Hermes doesn't learn this is his fault, because if he does he'll either switch sides or drop out entirely.

Setting aside the fact that Venat could have just told them without telling him, Hermes already told them everything relevant to the situation that he knew, and Venat already knew the solutions they needed to stop the Final Days - Before 90% of the planet was wiped out even. She basically allowed millions to die, declared the test failed, and then killed everyone else.

Not talking about wisdom. The zodiark side suicided because they wanted a quick way out from their problem. They gave up and refused to overcome their problems. They wanted a return to their blissful life but refused to confront their situation.

This is a bit of a tiring argument given there are literally quests in this game where we help somebody commit eternal soul-suicide.