Expanded use of Vaults

There are many structures which are the sole method to acquire one or a few important later-game items, such as the Ancient City (Swift Sneak), End Ship (Elytra), Trial Chamber (Mace), or  Bastion (Netherite Upgrade). These items are exceedingly difficult to get on multiplayer servers, as you often have to travel thousands, or tens of thousands of blocks to find one that still has its item. The Trial Chamber solved this problem, by the use of vaults, which can be opened once by each player. I suggest that some of these structures contain vaults for their unique items to give a more balanced experience to all players, regardless of how many of them there are.