I feel that the factions sort of represent each class in a way. Dead orbit wants to leave earth before its to late and explore for a new home. I always felt that hunters were kind of like pioneers in a way. Future war cult works with titans since titans are tanks/war machines. And New Monarchy would be warlocks because I feel that the leader of New Monarchy is a scholar trying to have earth be leaded by a King or Queen (this kinda gives a futuristic middle earth feel with mages too). You could understand this more if you listen to some of the dialogue with the faction representatives when you pass by them. Its not always "Hello Hunter" or "Wanna fight the good fight?". I hope some of you guys agree with this or share some of your own