Lots of inspectors know the difference but are given way too many inspections in a day and not near enough time to do them. They are told they must get them done, "we don't roll inspections"! ISO and IAS, as big a PITA as they can be have guidelines for workload, and 30 or 40 inspections (I have seen a lot more on occasion) don't fly. Sure, an inspector could refuse and say "I can't do a quality inspection in that amount of time", and then he could apply for unemployment. MOST places have found a happy medium, some, maybe like the OP situation, have not.