One of the assertions I find the most interesting about the ultimate fate of the Ancients is the idea of the game trying to show us that they were spoiled.

I remember when Shadowbringers first came out and all we had was Amaurot as a depiction of their lives, people wanted to say that they brought their deaths upon themselves because their "creation magic was obviously a drain on the planet", even though the game specifically goes out of its way to point out that all creation done by them is through internal reserves of aether.

When we got the side stories that gave us even more glimpses into the internal workings of their society, suddenly everything shifted. Now, rather than being an unnatural drain on the planet, the line against them was that they were too obsessed with upholding the natural order, which is, of course, why they deserved to be wiped out.

Finally, with Elpis showing us the widest picture yet, we're back to yet another reason why they deserved to die: they're spoiled (even though they talk amongst themselves when they're facing emotional problems?), decadent (????) and weak (all four of the Unsundered we know spent 12000 years in the single-minded pursuit of what they thought would save their world).

I'll be blunt. There is no reason the Ancients deserved to die. The fact that they did is a tragedy and not one they brought on by doing any one thing. It's a lying comfort to pretend tragedy only visits those people and societies that deserve it.