What if the side missions which were made available to the player depended on your Race??? And Perhaps other side missions could have been related to Class??? For example, the Resputin Side Missions could have been Human Side Missions. Awoken could have side missions about the Nine or about what the hell happened to them out in the Reef. The Exo would, of coarse, be missions about the origins of the Exo. Hunters could be given a few missions on planetary exploration; early access to plaents to scope them out. Nothing really special. Titans could have missions related to the defense of the Wall, and the City. Perhaps the Twilight Gap??? Warlocks would be given missions on the Traveler and about Light. Perhaps making an expedition to the Traveler, or to distance and dark reaches of our system to find out some forgetten secret. All these missions would be inaccessable to the other repective races and classes... unless you joined a fireteam with someone of another race or class. To this, the player would have a greater motivation to try out the other classes and races, and another incentive to play together.