I have seen this suggestion a lot and never has it made more sense. In ROI, Bungie was the one to put more emphasis on sets. You have the Days of Iron set, the Iron Banner set (the same as Days set though), the new iron engrams can get you Year 1 IB sets, Trials sets, factions & vanguard sets, house of judgement sets, and Queens sets. In order to wear the whole set you are or most likely sacrificing: 1) Use of exotic armor 2) T12 armor if you have it 3) use of good perks you have on other pieces So yes, there should be a bonus for wearing a full set