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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Agree with others about turning them into a strike of some kind. But as a mission this and zero hour are vastly overrated. Never understood why these are so loved by everyone. I could see these being more viable if any exotic could drop after the first completion.