This is an interesting topic.
Growing up, my father often told me I didn’t speak clearly. Of course I sounded fine in my head. Coincidentally, I also had several ear infections and it was frequently reported that maybe I wasn’t hearing very well. And a couple times I had the tubes put in to drain things or something.
Then, years later, my fathers siblings have worn hearing aids for a number of years so maybe his hearing wasn’t very good either.
Then later on, if I play back something like my voicemail recording, I think I sound so nasal.
Fast forward now…I’m in hearing aids and this topic…yeah…very probable.
Maybe a life long hearing affected speech “impediment”.