You obviously don't know what you are talking about. They are required by law to give "dispensing advice" to each and every customer. They need to know what to dispense and how it interacts with the other medication the patient is taking.
They need to know the patient's medical history to keep from dispensing something that will kill them whether prescribed or over the counter. Many pharmacists are also consulting pharmacists for nursing homes, special care facilities and hospices which requires more certification and written reports for each and every patient.