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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While it might go away when fotl ends, something like that will probably come back in renegades. Especially with them adding more armor and armor perks.