So I just read an article about how the destiny story doesn't work because "You cannot have a mute hero who is also a generic nobody while also being heralded as a world-saving god among men." I think it would add way more to the game if our guardians responded to shooting things or throwing grenades or simple things like that. I'm okay--albeit only partially--with us not having things to say in cutscenes but if we had a few things to say to what we did during gameplay that'd be awesome.
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Even Master Chief and Noble 6 spoke. The Rookie was a mute, but everyone knew it and treated him as such. Every cutscene has the Vanguard getting angry at us for not answering and letting the Ghost talk for us instead.