Even though I don't agree with the extent of what we don't have, Bungie said from the beginning that they intended to build upon and improve the game over a decade. It was never their intention to give us everything from The beginning. It can be thought of as almost episodic, or really more akin to expansions in mmos. We are given a bit at a time until we get a full picture. Not saying we get a good amount of content with each "addition". This is just what was always intended (perhaps not to The same extent). The base game was just meant to set up the world and give us enough plot points to explore over the course of a decade, never to give us a complete storyline from start to finish. This is chapter one of a whole saga.