Earlier quoted context omitted.
What's better for them should be the overriding concern and that's to have a normal development.
I don't know if it's the case for folks with Down Syndrome (I suppose it's likely not), but hearing-impaired folks have their own culture to the point that in the past it was seen as some as a betrayal to the community to seek out cochlear implants. I think having their own language does a lot to create unity among them. All that above is to say that I wonder if some folks in Down Syndrome might actually prefer their…
Cochlear implants are reversible. A genetic disease is not.