This is the first part of my wishlist to audiologists and accousticians, hearing aid manufacturers, and the health care system. If you like to add something, share your experiences, or provide more information, I encourage you to submit a comment.
Nowadays hearing aids still don’t fully compensate a hearing loss. They fail particularly in difficult but frequently occurring acoustic situations. The reality is that the cocktail party problem still exists and that it makes life hard for the hard of hearing. Hearing-impaired people still avoid noisy situations like in restaurants, bars, at parties, or any kind of event where a lot of people are talking. Since those are exactly the situations where people socialize, hearing-impaired people have significant problems in connecting to other people – both in their personal life as well as in professional environments. That means if you are not able to make friends and business partners, you will get isolated and won’t make a career.
Also, many hearing-impaired people depend on lip-reading and ‘guessing from the context’, because hearing aids are just not good enough. It is not uncommon that hearing-impaired people still avoid situations where they have to rely on acoustic channels and switch to workarounds like subtitles for movies or text messaging instead of calling on the phone.
One specific problem of the signal processing of hearing aids are feedback loops. Feedback loops occur frequently when something is close to the hearing devices, for example if you put on a hat, if someone hugs you, or you lay down on the sofa to watch a movie. The only effective measure that today’s hearing aids have is to detect the feedback loop and then damp the affected frequencies. But those frequencies might be the ones that you need to understand speech. Thus, you have the choice between wearing a hat on a cold winter day or being able to understand the person in front of you.
See also the next point on my wishlist: Compatibility between vendors for hearing aids and peripheral hardware.