Izanagi-no-Mikoto believed that humans were too weak; even those Spirit Transmutation cultivators who had reached the Peak Stage were nothing more than slightly larger cannon fodder on the true battlefield of Hell.
The gods were the ones truly in command of the war against the Hell specters, so everything had to serve The gods. "The gods do not need brand-new clothes, nor do they need food to satiate their hunger; what they need is the continuous stream of faith and worship from humanity.
After some research by the local deities, it was found that in dangerous and harsh environments, humans struggle to meet their own needs for food, clothing, shelter, and transportation. A great scarcity of resources and the pressure of external crises give rise to more devout and purer faith in humans.
