If a machine doesn’t function correctly or well, then fixing it requires blaming some part of the system that can change for the better. The dishwasher cannot change; it’s just a machine. It could be replaced, but that might be expensive. Much cheaper for the operator to change what buttons they press on the dishwasher instead.

If that requires reading a manual, or carefully timing the actual length of each wash cycle, or making a recording of each of those wash cycles so that you can work out how long they fill for and how many pre-washes and rinses that they each do then so be it.