Ya with loot and secrets, it would be neat if they gave the Primals another use. Where if you use them in a certain area like Ifrit in a certain part of the forest, the trees in said area would burn and reveal a new area which would be accessible for 1 RL week. Shiva could freeze water revealing a previously inaccessible island etc etc. Of course this would be for the entire world so if a LS wanted to unlock an area everyone would be able to check it out otherwise it would just get to messy to deal with lol.