I think you're imagining CIs as shiny and perfect technology, but they aren't. Check out this article below for some details. [1] They take quite a long time to learn how to use. Also, for people born deaf, their hearing isn't restored, it never existed, so it becomes an addition and an added responsibility. It's two new skills - hearing and speech therapy - they have to learn since ASL/etc is already their first language. It's really just a random cultural conditioning that we tend to think we have to be perfect or even enhanced to have a good life, be loved, successful, etc., but there's much more to life than the hearing world.
> hearing > not hearing
Actually, it turns out "not hearing == hearing." They make friends, make money, program, cook, play sports, exercise, etc. You might say they can't do this with people who aren't deaf, so they have a smaller population to choose from, but their community is huge and well-connected. they actually don't need the rest of us. I sat next to a deaf guy on a plane and he ordered coffee with cream and sugar by typing on his iphone then read the whole plane ride.
[1] https://www.thisisinsider.com/why-deaf-people-turn-down-coch...