They've had multiple chances to reign in Osiris and actually make him a developed character, but they fail to keep any consistency relating to what happens to him emotionally. He always goes back to being an arrogant -blam!- by the beginning of the next storyline involving him. When being exactly that got his boyfriend trapped in a murder simulation, got his ghost killed, and almost got himself killed during Lightfall multiple times. Yet he's supposed to be this centuries old radical thinker and super human intellect capable of out smarting the Vex and reverse engineering their tech to work for him with little to no consequences? Because he doesn't act like someone capable of any of that. This guy was a former Vanguard Commander, and he doesn't even seem capable of controlling himself half the time. Let alone a massive army of super humans in defending the last of humanity from existential threats.