I'm more specifically talking about armor. I have like 4-5 different helmets for all my characters I don't use. Plus a couple of gauntlets. Yay or nay?
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I'd say no. As each exotic armor piece is great in certain situations. Who knows what situations will arise in TTK? Also speaking from experience i deleted Don't touch me's pre-TDB. Only to discover how handy they are in Crota's raid. It took forever to get them back again!
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I like to collect exotics. So I'd only delete them if you multiples of the same exotic.
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Yes, yes you should.