Book 6 imagines a world where food, clothing, shelter, distance, and ordinary shortage are no longer the main problem. In that environment, what remains decisive is character.
This makes the spirit world feel like a theological systems test. Remove scarcity and you do not automatically get heaven. You get revelation. What people actually love becomes more visible because fewer external constraints are available to hide behind.
That is one reason the chapter is useful beyond afterlife doctrine. It suggests that many human systems confuse solved logistics with solved morality. They are not the same thing.