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

[Jandor]

Hermes literally memwipes them to prevent them from chasing down and destroying Metion. There's no reason to believe they couldn't/wouldn't given knowledge of what happened. (Or at the very least prepare defense)

In fact, that act is evidence that they would, imo.

I wouldn't say no reason. Emet gets the knowledge of what happened, and says they wouldn't have done as well. That's a pretty good reason to be fair.

For him to be wrong, we have to buy into the idea that he gets the knowledge of what happened, and the idea of just chasing down the Metia and destroying them never even occurs to him. That seems highly improbable.