The only way I can see them not including this at launch because it wasn't 100% finished... It wasn't finished because bungie was too busy reconfiguring the game to stretch the playability ex. Heavy grinding, weekly resets, the cruelest RNG ever. They stretched the game out to make up for its next to nothing rushed narrative they had to redo And it was redone because they cut TDB and HoW Levels from the main story ... But it's all just a guess