A small suggestion that may take some time but would be incredibly useful would be having the ability to transfer items from your inventory to the vault and/or to other characters. It would be nice and alleviate the tedious time it takes to switch chacters and loading in and out of the tower multiple times.
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Greatest idea ever dude email this to bungie cause I hate switching character so many load screens. Also this game is becoming a 1 character (3 titans/3 warlocks so on) because how many shards for raid gear you need. So there's alot of weapon and gear switching