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

[Garet]

Same for us. Venat had no idea whether or not we would succeed past her death. She gambled the fate of the star on a hunch that her new best friend would be able to take care of the rest. We then proceed to power of friendship our way to the end of the game proving her right, but that doesn't change the fact that it was still at the end of the day just that, a gamble. The biggest difference between the sundered and unsundered wasn't our difference in susceptibility towards dynamis, nor was it how much more we supposedly respect life on our star (which we dont lol), the biggest difference between us is simply that Venat chose us.

This is why she had prepared the moon ark in case we failed. She did not go into it blindly believing we would surely win. Hence she even tested us before allowing us to fight meteion to measure if we even have a fighting chance.

Venat fought with the other ancient till the end. This is one of the reason she did not reveal what happened with the mind wipe because she feared Hermes might go against them against if he regained his memory of meteion and she wanted him as part of the convocation and an ally against the final days instead of an enemy. The vidoe posted here by me and another poster basically show a lot of her reasoning.