Most of the player base would love to keep the utility of the FOTL masks after the event for cosmetic purposes but why not also keep them as they allow for a universal interaction with the current armor sets.
I think doing so would be a big win for you and your player base.
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#destiny2
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Definitely armor set bonuses should be a mod slot that you can shuffle at ada-1...have it be apart of the master work process as the final slot for a exotic cypher and add it to exotics as well to boost the stat tier of exotic armor...