I thought the same. Like if ur mana is enough u can cast jt without the toll. But if u want pull a Makarav on 80k enemy of course ur toast. At that point it is a needed nerd else it becomes too op.
I think that Adam can spam fairy law like it's nothing, especially if it's against a single target, moreover he is a shinigami so he has a much greater lifespan than the average human