honestly, all exotic weapons that have different traits as obtainable should be imho, otherwise it just adds to vault problems, granted, I do think they need to change how crafting works like make it so that in order to be able to craft a trait onto a weapon, you have to first get the trait on a non-crafted weapon version and dismantle it and it will only work if its of the same exact type of weapon like say wolf-pack rounds on the ergo sum you must get an ergo sum with it.