For ordinary people, these two things might not be of much use. It took a long time for the water control pearl shell to form a Pearl, and the longer the years, the better the effect. However, the lifespan of the human race was there. By the time this treasure matured, the human would probably be long dead.
It was even more so for the Green Dragon conch. If one wanted to make use of the Green Dragon conch, they would have to wait at least a few hundred years. If they wanted to get another Green Dragon conch like the merfolk, they would have to wait a thousand years. However, at the moment, even a level nine expert could not live that long. So, these two things were not very useful to ordinary people.
