At the beginning of Wano, we had Hawkins using sea stone nails yo prevent Law from using shambles on Luffy during Luffy vs Kaido battle. At Udon we had sea stones being used to certain degree,that gave me hope that it will find purpose given that wano process higher proportion of see stones. Now we are in the middle of battle and we don't see it in play, do we use it just as plot device. Kaidos team could use sea stones on their opponents, it helps in battle. Or even ussop could find clever way to use see prism in his attack. I know we want to see an all ought battle , but this is war, with casualties expected either sides, so using every means possible should count for something. Just my thoughts.