Being a mechanic not only required one to be able to craft things from scratch, but it also required them to utilize other things in their crafting.
The most common application that one would utilize was coding.
Coding is essentially the body part of a craft, allowing the user to maximize the craft to its full potential.
Just take the modified Claymore Mines that they had sold for example. If the Claymore Mines couldn't be activated manually, then it would be no different than a stationary Claymore Mine trap that required the enemies to accidentally stumble across it.
Just thinking about waiting and waiting, along with the possibility that the enemies might not even walk into the trap in the end, would be devastating.
However, thanks to the application of coding, allowing the user to have a control button in which they could activate the Claymore Mine regardless of the enemies had stumbled across it would be game-changing.