This probably seems insignificant, but I was playing Crucible last night and my son was watching. At one point I had lost my shield and he turns and says to me,"Dad, why do you have a heartbeat if you're a robot?" He's 7. I told him I had no idea and laughed. I had never even thought of that. My character is an Exo Titan by the way. I feel like Bungie missed a couple of things. Like a heartbeat in a robot. Or how a Ghost can resurrect a human skeleton and turn it into an armored Guardian after they've been dead for a couple hundred years.