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

[Kozh]

Considering the other researchers we speak to offer glowing praise, he was so good that many he was seen as capable of of representing humanity, and that he was specifically chosen by the facilities previous chief, I’d say there’s a lot in his favor.

Well of course the writers would want to justify how hermes is suitable for his position. But if we were to analyze it from outside perspective, it's a weird decision. If it's only for his aptitude in flying creatures, just being a researchers there is enough. No need for him to be the chief.

Then you agree then that sacrifices would continue if they thought it would solve an issue their facing?

Not really. Yes to the third sacrifice, but after that? Why would they need to sacrifice more to begin with if the final days has stopped (at least to their knowledge)? Plus, zodiark isn't some mindless primal that will grant them every favour. With elidibus as it's heart, he's the one who decide what to do. Hence why he still sought peace with venat's faction.

And honestly, I don't see why the sacrifice is such a bad thing. Third sacrifice and the sundered sacrifice are bad, yes, but sacrificing themselves isn't. That's their own choice.

Not especially, as he never shows signs of knowing the specifics of Meteion, only recognizing that the Final Days would continue with Zodiarks destruction. The Watcher repeatedly states he’s not their to judge or hold positions on the issue, just to do what he was created to as an arcane creation.

But in the crystal memory log, he refers "they" for the convocation, and "we" for the venat's faction. I don't know how to post pictures, but you can see it at Garland Tools. But anyway, they probably make the Watcher to be very vague because they want to keep meteion and dynamis as a twist/surprise.

Either that or Venat doesn't tell her followers, or that she doesn't think the Watcher need to know everything.

(my guess is first explanation)