Did I skip something in the MSQ? This part doesn't make any sense to me

[Lady_Silvermoon]

I think it's essentially that if you try to preserve everyone in Living Memory, each possessed of a soul from the aetherial sea, then eventually there will be no souls remaining for the actual living and everyone will merely be in Living Memory. But worse, this was headed to come at the expense of the souls of other shards.

Ultima Thule differs because they aren't being endlessly created. Those that exist now, exist. They may have off-spring, but there is no guarantee that their parents can't pass on. The Omicron are also unlikely to have more of themselves created. It's limited overall by the supply of Dynamis there, which isn't infinite, so something would eventually give. Which is probably why when you finish the tribal quests, it's not as complete as you'd perhaps want.

Living Memory doesn't run off souls. There are no souls in living memory besides those of the player character and our party. The Endless are made of memory aether and corporal aether (life force) making them more akin to digital vampires. Souls are eternal, had they been left with their souls and simply kept out of the aetherial sea then they would be ghosts with no need to take anything from anyone. And if we killed them under those conditions, then we'd be the ones attempting to take their aether, so it's pretty clear why they didn't use the easy obvious method to achieve their goals that harms no one. They needed a contrived reason for conflict.

While the residents of Ultima Thule can pass on, several of the species they are modeled after are immortal and given when one decided to end his existence after fulfilling his purpose, we told him, "No, wait, don't, just find a new purpose." So...are we gonna go back and be like, "Our bad, based on new data, you should just off yourself after you've completed your function."

Also, not only is dynamis the most abundant energy in the universe, the universe someday ends. We convinced all those people to keep living life knowing that someday the whole server's getting shut down. We'd look crazy going back like, "Actually, nevermind, you should just stop existing now, even though we endured 12k years of torture to teach you how to live through any hardship you may face. Our bad. Big misunderstanding. Upon further thought, not enough energy in the universe to go around, so maybe you should consider packing it up."

I'm pretty confident the heat death of the universe will reach us before the residents of Ultima Thule breed us out of existence.