I understand that the whisper mission is getting vaulted because it takes place on Io, but... it's genuinely one of the best pieces of content Destiny 2 has to offer. I really hope they somehow repurpose the mission. If anything bring it back as an "exotic nightfall" where you can earn all the same rewards.
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Whisper mission and the outbreak mission should be turned into strikes imo. They could also keep the puzzles for ships in there for the pre made fireteams. This game is in dire need of a passionate game director or project lead director.