I agree, but we are not talking about the vast majority here. The audiologist we are talking about ignored Dan's complaint when it originally happened. All he had to do was take a quick look with his otoscope and he would have noticed a perforated eardrum. If he didn't have an otoscope, he had no business doing impressions where the first step is to verify that the ear canal and ear drum are clean.
Actually, he was asking the MDs on the list, which I think is a much better idea than asking the audiologist who has already been negligent. Of course it's up to Dan.