There is no tangible benefit to FC activities. If people in an FC want to do something with one another, they can. There's nothing stopping them from engaging with content already in the game while in an FC. With as many players as there are that prefer doing things outside of their FC, however, attempting to make FC-centric content would in fact serve only to alienate a not insignificant portion of the player-base. ....Which has already been alienated, repeatedly, as it is. Not a great idea financially.