This idea isn’t something that’s going to be completely game changing it’s just something that can help when you’re crafting something. From personal experience I find it annoying when I want to craft something e.g. a shotgun, and It says that I have no low quality metal in my inventory but I have metal fragments, enough to make the 12 low quality metal. I just feel it would be a little easier if you could turn them straight into a shotgun or something else of course factoring in the time taken to turn the metal fragments into low quality metal. You could also have something under the crafting telling you what also will be crafted e.g. something that says “Sub-Crafting: metal fragments -> low quality metal”.
Then again this is just an idea and may not even fit in with the game or be possible to create just, just interested to see what people’s thoughts were on something like this.