Sorry but I think you need to take the tinfoil hat off. Its obvious that the areas were made before the game was released but I have seen 0 proof that any of the glitchable areas are anything more than empty space. I know of people who have picked up the dead ghosts in those areas and even those are only place holders. No grimoire, nothing just empty rooms with no story, no enemies, nothing. There could have been something there at 1 point but there is no proof there ever was. I think to make the DLC's slightly easier to patch in they made these empty rooms only to be filled later after they put together a story that fits with the area.
I agree the game is different and smaller than I expected it to be but I am not mad. From various posts I have read it sounds like the game was changed several times before it was actually completed and due to deadlines the final game was smaller than they wanted it to be as well. This is life, shit happens. Like everyone else I over hyped the game and was a little upset by its shortcomings but honestly what I have gotten for 95 dollars so far is in no way a ripoff in my mind. I love destiny for what it is, an imperfect albeit fun game with a great feel and beautiful backdrop.