I'll say it now, Cayde-6 needs to die to bring some conviction back to the story and give the player some reason to fight. But, if we have to have the ghost talk for the guardians instead of them actually having a voice and true feelings for the loss I'm afraid it'll just feel empty and half baked.
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Didn't you hearthey are adding actual dialog options in the for of emotes. You will be able to emote in response to anything that is said to you during conversations and the npcs will react accordingly.