Some years ago my partner, getting fed up with me saying "Hey, pardon" or "Say that again" and then answering her question, made me go for a hearing examination. Yes I was partially deaf in my left ear from years of using a 12 bore shotgun. The few seconds it took to say "Repeat that" gave me time to make sense of what I bit I heard and work out the rest.
I was issued with a free of charge, National Health Service hearing aid, which I got along fine with. It was an analogue one but a couple of years later it was change for a 'much improved' digital one. Unfortunately it picked up so much background noise that I found out I was better off without it. Now I have not worn it for three years.
I think that this is a subjective matter, it depends on how much loss of hearing one has and the quality of the hearing aid that is being used. The individual has to decide whether his hearing is better with or without an aid.
My hearing is slightly impared I am happier without it, someone with a more chronic hearing problem will no doubt be better off with one.
Roger