After having played The Division, I've gotten to experience why. Its called Tragedy of the Commons. Early in our history, people who had herds of animals used to be able to graze them on the village commons. But since no one owned the property personally, no one had any investment in protecting them. In fact it was to their personal, short-term benefit to have their flocks/herds OVERgraze the land...and most people wound up doing it....and the land eventually failed IOW. Bungie wants you to have to expend effort to find people to play with, because you the effort you put in will cause you to INVEST in and value those relationships. So you wind up with a stronger community as a whole. But if the game does all the work for you....like the Commons....people will tend to behave badly. They'll exploit the game an the people in it for short term personal gain....because there are few if any personal consequences for doing it. So you wind up with a game that a weak community...that is often toxic and divisive. Because its everyone for themelves. The Division had in-game matchmaking for every activity....and as a result you had no reason to expend any effort in fiding people to play with...and so no one formed any long-term bonds with anyone else. So that game, right now, basically has NO community....and what little community it does have is self-centered and toxic.