Let's play a game: Save the Ancients!

[Cleretic]

Venat intentionally didn't tell them for one reason: She was idealogically driven. She wanted to fix what wasn't broken until Hermes got a hair up his arse in the first place. So even if she had known such was possible, she wouldn't have told them anyway because she believed they needed to change when really, they didn't.

Riiiiiiiiight. And Thaliak? Menphina, Azeyma? The Watcher? All those bright sparks, in highly respected positions in Ancient society, were they also 'ideologically driven', or were they somehow too dim to ask questions, but not so dim as to work on Venat's solution? Your image of your beloved Ancient society is one that can apparently get swayed pretty hard by what you seem to think is an ideologue with nothing but selfish delusions of power.

You really don't think the Ancients are better than that as a people?

EDIT: And this still doesn't explain why the unsundered weren't mad at her after learning the truth. Surely, if Venat were a selfish shallow ideologue, Emet would've been so mat at her for ruining the perfect future the Ancients could've had without her, instead of begrudgingly respecting that she made the right calls. Or is your image of Emet also too dim to realize, even if given perfect hindsight?