Except bungie has a very well documented track record of a "lack of foresight" when it comes to weapon design. The black hammer is a pretty good item to note for this. As it was a legendary that could consistently outperform almost any exotic heavy when it comes to dps and total damage on enemies with a crit spot. The devil you don't on the other hand was just an example of a piss poor weapon design. As it was a high RoF hand cannon that held 5 bullets in the mag. It's predecessor could hold 12. And it had a stronger impact as well.