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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Oh man, if it got turned into a strike, I'm sure I'll be pulling my team through the whole time.