I don't know a lot of specifics but I do know hearing aids have come a long way. There are some new ones out there that are very small and not very noticeable. They fit inside your ear rather than around the outside of it. I had a friend 20 years ago with one and she loved it. I'm sure they've come even further with current technology.
The challenge with hearing aids is that they tend to magnify all sounds, not just the sounds you want to hear. Particularly if you are in a noisy setting, it is hard to filter out the things you want to hear because the extraneous noises are magnified as well. I don't know if newer ones are able to filter out the junk noise, but that is the most common complaint I hear from people. Many hearing aids don't filter like your brain can. But it's worth checking the internet to see what is out there these days. I think newer ones address this issue to a certain extent.
When my father-in-law was still alive, I talked with him about hearing aids. No one else could talk any sense into him and thought he was just being stubborn. I had a different relationship with him. Even after we talked, he never got a hearing aid. But I chuckle about our discussion that day. A relative in the other room, with a sharp, nasally voice, was busily talking about everything and nothing at the same time. He responded quietly with a wry smile, "Would YOU want to hear that better?"
Cost was definitely a factor, plus unwillingness to change and self-consciousness about the realities of aging (pride), were all factors for my FIL. It irritated many because it felt selfish to make everyone else shift to his needs for volume (TV, conversation, etc.). But maybe it was also a little bit about enjoying the peace and quiet, too. : )
I would start with the internet first until you get more responders. Good luck exploring!