One of my personal favorite features of the PS4 is the speaker in the controller. It adds a whole new level of immersion to games. When I started playing Destiny, I was honestly pretty surprised that they did not utilize that particular feature, especially since they utilized the light bar. I think it would be really cool to have the option to be able to hear some voices, particularly the Ghost, through the controller speaker. It would add to immersion and make you feel more close to the Ghost and the action. Plus, you could still hear important things when you have your speakers down or are listening to music.