Originally Posted by
tokinokanatae
I think the reason saying, "the Ancients failed Hermes's test" is getting pushback is because of a lot of interconnected factors.
Zodiark as a solution is, frankly, a monument to the ingenuity of the Ancients. Everything we can infer about him from Endwalker tells us that if pure "survival of the species" was the metric for pass/fail, then he likely is a passing state. The rest of the universe might decay and die around Etheirys due to the song of Meteion--and heck, Zodiark might not be able to hold out against her forever--but they'd probably last for a really really really really really really really long time. After all, the "pass" state of Elpis isn't "can this species live forever and ever up to and including the heat death of the universe" or "can the test subject assert their ability to survive by (potentially) murdering the test giver" either.
Where things get sticky is Venat's addition to the equation. Venat introduces a moral component that frankly, isn't there when it comes to the test species must pass for Elpis. The fire wolves were not culled by the researchers because they were "evil" or "bad", but that their innate nature made them disruptive to any habitat they would be introduced into.