The engine (to my surprise also) actually is pretty crap in the development department. There was a post circulating some time ago about the pitfalls of Destinys development. In that article it stated that it literally takes hours.. like damn near 8 hours just to load up all the backend data to make a single change in the game.. include saving over the network and debugging every time you change something and this thing becomes a grand mess.. Destiny has more problems that just the introduction of weak content.