DRY, also known as single source of truth, is one of the most important principles in SE. I just could not figure out what the single source of truth is in a fa

DRY, also known as single source of truth, is one of the most important principles in SE. I just could not figure out what the single source of truth is in a factory pattern as is the electronic circuit factory. It implies centralizing the code which is responsible by the fabrication of the circuits, what would be their equivalent in the game? The conveyor belts? Microservices, on the other hand, are overrated and unnecessary in most cases they are applied.