Well... Let's say you get a legendary Titan hat and have a Warlock or Hunter... Do you save the legendary or exotic item for another character, or scrap it for parts now?
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Obviously keep it. Maybe if you get bored of your character "Which you probably won't" you could start a new one and use all of those items to jump ahead.
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I saved mine. When I made my Titan, once I hit level 20 I had gear that brought me up to 26 and when my Hunter made it to level 20, I was instantly level 25.