They didn't bring back voice acting because the Guardian is supposed to be you, yourself, in the game world. Remember when they added voice acting for Fallout 4? People hated that. Especially since it was one generic voice for each gender. That took away the image that you are the one who is saying something to the NPC, not someone else. Same thing with Destiny. How your character reacts to the world is how Bungie expects the player to react, not someone else. That is why some silent protagonists, like Link from The Legend of Zelda, are loved.
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Excuse my, female SS in F4 is voiced by the same lady that voiced Jack in Mass Effect. She great :<
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I understand what your trying to say but answer me this, why does your ghost always speak with everyone as though he's speakin g for you?
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Your ghost is subconsciously controlling your every action and forces you to do his will