So hear me out. Imagine 1 slot for the extoic and 4 legendaries to match the set once built utilizing piece by piece additional stats and bonuses and an awesome ability or effect that only a full set can do. Kinda like how Diablo has armor sets with added powers, etc. Start of 3 sets per sub class.
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Gear sets are great in games like the division. But in Destiny I highly doubt, that bungie can balance them right. They barely can manage the weapons, and exotics.