Once done with the main storyline, the quest for exotics and other loot begins though a great number requires teamwork, some can be taken on alone.
Destiny has loads of quests for the Chosen of the Traveler as the main storyline progresses. There are those among us that take a different path accepting challenges and willing to invest hours of frustration for the satisfaction of attaining that one piece of item that stands out all alone.
The lone wolf stereotype is still alive and kicking.