MMO: Massive Multiplayer Online. A classic sign of an MMO is the need to link up with other players to explore/conquer certain aspects of the game. Which is a huge part of Destiny mind you. Bungie can say whatever they want, walks like a duck and quacks like a duck. Must be a duck. Lastly, Bungie has said on multiple occasions they asked WoW and multiple other MMO games for advice on different topics. (Biggest consensus was to never implement a trade system by the way). You don't go to the world leaders in a topic and ask for advice you don't need...