Probably because their lead writer Joesph Staten left the train and took all the story telling goodness with him. Look at his latest game sunset overdrive, aside from the game itself being fun the story is actually good as well. Instead all bungie wants to do is make you go to their site and read grimoire cards. Using lore to tell a story can be effective, look at dark souls 1/2 and demons souls, there is literally nothing but exploration and good atomosphere that makes you want to know more about the world and you can find all the lore [b]in game[/b].