I think this is a seriously excellent point. The bet that I am making is that the system reduces its error rate by splitting a broad task into two more focused

I think this is a seriously excellent point. The bet that I am making is that the system reduces its error rate by splitting a broad task into two more focused tasks. However, it is possible that generating meaningful test cases is a harder problem (with a higher error rate) than producing code. If this is the case, then this idea I am presenting would compound the error rate.