It might be interesting to have defective items in the game. Not having them pop up randomly, this would be a nightmare. But having machines produce trash / faulty items when using faulty items or if a power outage occurs during production could be nice.
You lack power -> a few machines will produce trash, the next one will produce trash because you feed them trash... so power outage make you waste time even after you put power back on. It's not very punitive, but interesting as it won't affect every layout the same way. For example having separate generators and factorie would make your production more reliable.