I'd like to see one last small yet super fun event where the exotic limitations for armor and weapons is removed for all Destiny 1 game types. It could last just one week and they could make it during iron banner where even ib could be mayham again. There wouldn't need to be any decorations or any real preparations for it, just turning the exotic rule off and a notification announcing it.
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Make every gun like in year 1 or when it was fun.