Instead of 64 slots in your vault per character which is 192 slots in total we could save a lot of space when Bungie would change this class item.
Just unlock the perk combinations that you find on the exotic class items so you can just select these combinations. This way we only need to save 1 exotic class item per character.
This also saves a lot of vault space.
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Or, hear me out, don't save everything in existence. Not everything is worth saving. I bet if all of the people complaining about vault space showed what they have in their vaults, over half of it can be deleted due to it being trash, multiple of the same gear with the same rolls, or gear that they will never even touch.