I love this idea. A lot. It sucks to form a personal bond with a weapon, only to have to throw it away because its stats suck thanks to a rebalancing or more importantly, new piece of DLC. For us more RPG minded players, this would add a lot of value. Of course, the more freedom they give us for crafting gear, the harder I want it to be. I would hate for an easily craft able handcannon to outperform an exotic. I'd be perfectly fine with heavy raid requirements for finding the perfect firing pin (or whatever)