It's a double edged sword, because it shrinks the already small deaf/HoH population and we can't yet eradicate hearing like we can smallpox(completed), polio(mostly gone), etc.

It's awesome that it works for some people, just like CI's work for some people(but not all).

Until we can restore hearing(or insert favourite disability here), to everyone, it's going to be controversial inside of those communities, because it makes our already smaller world, smaller. Which causes lots of emotions as you can imagine.

That doesn't mean our world has to be smaller, even now. There are lots of things we can do to make deaf people's worlds bigger(and again, insert any other disability here). We choose not to do them because some people think they are hard, some people think they are expensive and some people think it's not needed.

Perhaps some of that is true, for some items on the massive list.

“Blindness separates people from things; deafness separates people from people.” - Helen Keller

Deafness doesn't have to separate people from people, but it does.

Until we can eradicate XXX disability completely(unlikely) we should as a society strive to make their worlds bigger, not smaller. Sadly so many people don't feel that way, for various reasons.