guys we were just suppose to let sphene end the multiverse didn't you know the end of us was the good act.

on a more serious note sure we could have gotten a perfect ending where we magically figure out some out of world way to keep everyone and noone dies but that wasn't the point of sphene or her world it was to show we have to move on and let the past go death is part of life and holding on to it for ever will only cause more pain and turmoil.

on a less serious note AI are not real no matter how hard you try the people we met weren't the originals they were fakes. heck the story even tells you how that sphene had no memories cause they were lost and was just given her zealous love of her people and the task of keeping them alive eternally.