CI is not more beneficial in all cases. And because, the surgery as performed most often, destroys residual hearing, so you have to weigh the loss against the gain in the instance that it does not work. It is an invasive surgical procedure, and, as with all invasive surgical procedures, they are always used as a last resort. Cardiac surgoens don't opt for implanting a pace amker in patients that can have their disorder treated with medication, either. There is a reason for that. OB-Gyns don't do a C-section of a woman can give birth naturally. ENTs don't remove tonsils if an antibiotic will cure the infection. Very simple.
