My experience with "business domain experts" is that the majority of them are simply executing a process that someone else defined a long time ago. Their definition of "success" is usually that all steps within the process execute successfully without error and they can move on to the next transaction or activity. Very few of them are capable of taking a step back and considering what the process is actually trying to achieve and whether there might be a better way of accomplishing it. This leads to constant "paving of the cowpath" where archaic processes just get replicated in new technologies every so many years.