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

[Raoabolic]

Agreed. I feel the big problem here was how it was presented. It was the last zone, of course we knew they were copouts and how it was going to end. Had the script been written with us losing each Scion one by one after the Final Days started, somebody in Radz, somebody in Thavnair, somebody in Garlemald, Thancred's sacrifice, Estinien's sacrifice, and then culminating in losing the twins before the final walk, THAT would have made it hit even harder. Yes, them coming back would still be a bit of a cop out, but I think a lot of us would have accepted it a hell of a lot better.

That would not have been a bad direction if the writers wanted to keep key characters for the future. Sentai does that sort of thing all the time and if it's good enough for Toei then it's good enough for SE!