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

[Lauront]

Hermes point was to hold mankind to the same indifference of suffering and death that it appeared to portray for the creations made. If mankind wishes to live it should do so without suffering for that is the ideal and value used to destroy these things I make.

But he's not even correct on that point. They weren't indifferent about it - we see that in sidequests in Elpis. His problem was that they applied a standard at all, i.e. permitting creations to persist only when they contributed to the betterment of the star. We see this with the lykaones, where he wishes them to live even if they were detrimental to the star's ecological balance. These are just arcane constructs in the end (even more abundantly clear with the sprites, where he discussed their impetus to exist), which might get a soul if they satisfy the star's criteria for doing so, and even then it'd just upgrade them to the equivalent of animals or monsters. Beings the sundered kill without a second thought, much as they send their own arcane constructs, like egi, to die for them. Moreover, he also had a problem with his mentor's decision to return to the star. None of what he said is going to stop us from going on hunt trains to reap souls to fuel our next relic, for example... His real beef was that existence itself ultimately entailed death. In the end, that entire line of thinking is discarded by Venat who is only concerned about answering his question for the purpose of surviving to drive back Meteion. He is little more than your typical pathological "empath" with a sadistic streak.