We might use it as a spring board for developing psychic abilities. If science can reproduce OBEs in the lab, they may discover the scientific laws governing mind and matter that psychic abilities are only hinting at today. Some people have even suggested the possibility of using it for industrial espionage, covert intelligence and similar applications. Above all in importance, I believe astral projection can help us become more spiritual. Spirituality should not be used as a license to justify immorality, nor should it be forcefully pushed on other people.
Spirituality is a personal thing, and it means something different to everyone.
Of, concerned with, or affecting the soul. If you leave your body, you are spirit. You are not tangible or material. You will be concerned with and affecting your soul. And you will have the nature of spirits.