Personally, it feels like Destiny 2 was built off a pre-alpha build of Destiny 1. When developing Any game you come up with different builds to see what works best. It just feels like they took one of those builds and built off it. The easiest option would have been to leave Destiny 1 there; in game and add to it, like Warframe does. Expand the game universe making it ever evolving. Such a simple concept yet how no one could see this within Bungie blows my mind. And even if they did, time constraints probably prevented them anyways. After all, 2 years is not a lot of time... That being said it just adds more weight to the point i made earlier where Destiny 2 was a pre-build of Destiny 1. All they had to do was change the cosmetics and voila, destiny 2...