There's a common sense factor that these guardians aren't grasping. 3 characters with a dozen slots in each weapon and armor category, and the vault?
There's plenty of space for anything a guardian needs and some. You don't need two of the same gun...ever. You can't play two characters at the same time, with the same gun.
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New players will likely take any powerful gun they can get their hands on, even a duplicate. I played the same way when I was new. However, they will learn, just as I have, that each new DLC set of guns makes that strategy increasingly difficult to manage. I would advise that they start early to avoid the headache of organizing 2-3 times as many weapons and armor.