I have to ask people to repeat themselves but ONLY CERTAIN PEOPLE. I had a hearing test a couple of weeks ago and was told that I DID NOT need a hearing aid, my hearing loss is so minimal that it would not make a real difference. I noticed that I had zero problem understanding what the technician said. My conclusion was that I work with some people who speak and with some others who only mumble and slur as if they were drunk.
That’s an interesting conclusion and I’ve wondered the same thing. I had an auditory test about five years ago and, like you, had good results (very surprising). Some people seem to not enunciate clearly, mumble, or speak very softly. I hope it is their fault!