While I have my issues with Endwalker, one aspect of it that I think works really well is Meteion's decent into the Endsinger (and even there I think the things presented in the dead ends are a bit silly) and I think a very central reason it works so well is that we're repeatedly shown how little regard the Amaurotines have for life, both other people's and their own. In Elpis we are shown how they eradicated entire species for being inconvenient and we learn how most of them eventually end their own life once they're done with work. Of course Meteion would feel like life is worthless, coming from a society like this.
There is also the fact that they were willing to sacrifice three quarters of their population to Zodiark, or that Venat was an outsider for refusing to end her own life and instead enjoying the world after she was done with her work.
And now the twelve do exactly this again! They're done with their work so they end their life, except for Oshon, who wants to continue enjoying the world. Except this time the game is portraying this, while not necessarily as a good thing, as a thing that is reasonable for them to want. I feel like it goes against the core theme of endwalker for them to just throw their lives away like this.
And this is just my issue with the ending of the Myths story, it had plenty of awfulness up to that point. Easily my least favourite story in the game by fair, and the fights aren't even that great compared to Nier and Ivalice