So basically each piece of armor should have a perk that are useful in the raid where they are earned, I'm pretty sure that's how it already works (I know for certain that how it worked for WOTM armor).
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Totally missed the point of his post. You should get multiple perks for each piece in the armor set you wear.
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Bungie doesn't want to make us OP
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If that's his point then I completely disagree with it, you don't need multiple raid perks on each piece of armor.