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

[Jandor]

I guess that could make sense... assuming that the Ancients aren't Aether dense enough to resist or bring enough aether with them, since there isn't any there.... although I think most if not all of our magic relies on Aether and it works there fine...also she wouldn't have had 1000 years to collect dynamis, so she wouldn't be nearly as strong. If they had a means to travel there they probably would have snapped her like a twig... she would still just be a familiar.

I think it's fairly safe to assume that their higher aether density and quicker arrival wouldn't have made a difference, given that Emet quite plainly tells us that they wouldn't have made it as far as we did.