The info is there, you just need to be connected for interpositioning of different players, and data storage for your character. All map data, enemy AI, texturing, etc are all on the disk/hard drive. The fact of the matter is that, to put it simply, the old consoles are simply too weak for many of the features people want/wanted to see. The high detail graphics take their toll, and throwing in More characters/players, enemies, and interactivity would be the breaking point for the old consoles. Remember, they're ten years old. Every time someone around you in game does ANYTHING, your console needs to register, comprehend, process, and show you that. If there was a trading system, the game would need to be able to tell you whether that player was already trading with someone else, which would require the game to add that much more to its to do list. Keeping track of more players, more enemies, etc would be the breaking point. Destiny as it is was already pushing the limits on the old consoles, shown by the fact that the game runs natively at 30 fps, and how the graphics had major cuts for the old consoles.