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

[CrownySuccubus]

That'd just be strange to me, since the Garleans were only in the position they were in out of necessity as a consequence of being targeted for genocide throughout much of their own history. Furthermore, they didn't have the plot convenience of a Warrior of Light to wander their lands and conveniently solve every issue before it festered into something that required getting one's hands very dirty in order to deal with.

The Sundering was a stupid move in general and I don't think any society 'deserved' to be wiped out. Even the Allagan Empire had good people living within it during the height of its decadence.

Endwalker in general has a pretty weird take on the concept of 'suffering' and 'moving on', though.

That's why they said "it wouldn't be morally justified". Doing bad things to stop people from doing arguably worse things create a much more decent gray area. It's still morally ambiguous, but at least it would be better than what we got. (I personally would have hated it due to personal tastes, but it would at least have been tonally consistent.)

Or, they could have just left the Ancients as "utopic" and kept the Sundering as a tragedy and not some moral statement.