In that dream. "Dr. Roman" wakes her up and tells her she has short time left to live, sweetly talks her about how is easier to give up and how restoring humanity isn't worth it because human life is meaningless, a life that ends has no meaning, so history is unnecessary and is rubbish. She shakes her head and sharply says to the guy "You're not Dr. Roman." Because he can be pessimistic, but Roman values and wants to save history, the figure flickers and his shape shifts and now has glowing red eyes, shark teeth and facial markings, it was the last boss who was trying to trick her. But his words shook her. Then she asks Roman that question, Roman agrees that life by itself has no meaning, objectively speaking  however we can found meaning in our lives toward the end. He's trying to say what matters is our journey and how we weave our life with people around out, at the end it gains meaning. That validates history which is humanity's journey as important, and the opposite of the "life ends so is meaningless, history is worthless."

The final boss phrases got clunky translations but he was saying basically this earlier. That is pointless to fight because their existences are finite and will die. Thus there's no meaning. This is hard to come across because the translation is pretty bad.