Quoting Ornyx's response here:
It is intentional that the quests “In Nightmares” and “Essence of Power” cannot be completed on Raid Finder difficulty. That quest chain is intended to provide a cosmetic reward for participating in organized, non-matchmade content. As such, we wanted to keep this step in line with the previous steps in the chain, which require completing Mythic Dungeons. |
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As a follow-up to this as I saw a little bit of discussion in this thread regarding the latter point: You will still be able to complete The Stuff of Dreams within Raid Finder for the Good Suramaritan achievement. |