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

[Skyborne]

...

Couldn't have said it better myself... honestly, having a 'last Ancient' lurking around somewhere would've sufficed for me (no, not mother dearest, her job is 'done'), even as a more symbolic figure who we rarely see who acts as a bridge to the past. The Unsundered souls that were in Zodiark will reincarnate, sure, though it's not really the same thing. Their culture is gone, with the closest thing being Sharlayan which is basically the Great Value Diet Amaurot. In a way the ending of EW reminds a bit of that of FFVI's -- the Espers all fade away, and magic along with it, an entire element gone.

It's funny that I've spoken to length about friends how the game seems to really have an inconsistent 'throw away the past and just move on to the glorious future, never look back' sort of message as of late. Perhaps a way of SE telling us to not think of some of their past flops and embarassments? :^) And then, ironically, they give us an actual portal to the past we can waltz around into whenever... but nothing can ever, ever be changed, okay?

From what we had seen in dialogue, the Ancients had a plan involving Zodiark to sacrifice ancients the first time, sacrifice ancients again, then sacrifice the new life born from the "restored" Ehtheirys to bring all the sacrificed ancients back(someone correct me if I am wrong).

Right that is. You're not really intended to think about the Answers anime music video scene, it's all abstract and metaphorical. Just clap as the music swells and some anguished boomers are symbolically diced up. What a shame, since SE could've flexed their small indie company budget and showed us a cool Zodiark/Hydaelyn clash scene as bombastic as the Shinryu/Omega fight I really liked in the leadup to Stormblood.