Yes, I have hearing loss in some frequencies. When I wear my hearing aids, I can hear those frequencies. So if I was working for you, you would have an interpreter that hears all frequencies - as I mentioned, I wear my hearing aids at all times when I interpret. Is that unacceptable because I am still HOH?
It seems to me that the interpreter is the one who knows if they are capable of interpreting successfully. The client has no way to know the hearing ability of any interpreter. If the interpreter shows up to interpret, the client has a reasonable expectation that the terp is capable of giving all the information. Furthermore, hearing while interpreting depends on a lot more than an audiogram...as people have mentioned here already, acoustics, positioning, accents, and many other things affect how well any interpreter receives a message.
I fully respect your right to choose your interpreter, but I don't see how you can make the blanket statements about HOH interpreters based on your bad experiences with a few. I work with three other HOH interpreters besides myself on a daily basis, and they are all excellent interpreters. If somebody turned them down because they are HOH, I would feel sorry for the client, because they would miss a great interpretation that contained all of the information.
If you were working for me and I noticed that you wear HA's, your ability to interpret would be more scrutinized because of the doubt that HOH interpreter can interpret.
Do you want that?