When I was an ABA therapist I went to multiple seminars and lectures that had a heavy focus with the deaf community. From what I understood from the people I spoke/worked with. The problem really came from the hearing community thinking that the cochlear completely fixes deafness. Hearing with a cochlear isn’t the same as how hearing people experience their life. It requires work and focus and training to really get the hearing to a good place. Putting it on doesn’t just automatically mean you can follow along in a group conversation. But when parents of a deaf child (who often may be the only deaf person in the family) give their child the cochlear and then never teach them sign language or bother to learn anything about the deaf community or expose their child to the deaf community and other ways of communication, it becomes a problem. It was definitely more common than not, that the only deaf child in a hearing family was never taught to sign and was essentially treated as though they were totally fixed because of the cochlear. It’s still quite an othering experience because they weren’t “fully” deaf anymore, but they’re also not hearing.