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

[Teraq]

I'm still hoping the next 10 year arc is the WoL becoming progressively more whole (I need to have an unsundered Azem reunite with Emet & Hyth at the end of all this).

(inhales a long huff of copium)

We'll see if Oda sticks to what he said about the sundering being "unstable", which was while Hydaelyn was alive. The situation should start to fall apart now unless, of course, this is her once again not experiencing any of the drawbacks that others do. Zodiark's magic disappearing with his demise but Hydaelyn's not would sadly be consistent with EW's writing.

Of course. Only good magic stays. What is good magic, you ask? Well, Hydaelyn's, for starters, as the Mother Goddess of Light and Original Will of the Planet Made Manifest. Zodiark's, of course, evaporated as soon as he disappeared, as befits an ill-fated wish such as him. And, of course, Emet-Selch's Amaurot, which ... oh. His Amaurot stayed even though he literally died, but Elidibus's illusory star shower faded as soon as he was imprisoned in the Tower but he didn't actually die. Then we have Fandaniel's towers of the apocalypse, which... all disappeared as soon as we killed Anima? Crumbled? What about all the people inside? Was G'raha there to Break everyone's fall?? (I legitimately do not remember, that is how much gravity the first half of the plot was treated with) And that is just Aether-based magic, consider Dyn– Why am I asking this??? HOBBES HELP ME WE NEED TO REWRITE THOSE RULES

But yep. Dynamis has literally no reason to exist as it does, i.e. as some sort of "anti-Aether" which is inversely correlated to Aether density or whatever, other than giving us a very convenient excuse for wiping out the Ancients. The sole rule of Calvinball... Ancients can't win.