Pacemakers are foreign objects. People with broken bones sometimes end up with screws and metal plates holding the bones together. My brother-in-law had brain surgery a while ago (about 3 years ago) and now has a small metal plate in his head.
Thousands of people have foreign objects in their bodies. The vast majority of them have no problem with these objects.
I'm not advocating for or against a CI for any given person, just saying that evaluating the particular risk is important. That would include knowing the details of how the risks might have changed with improved technology.
Cheetah, right. I get what you're saying about gauging the risk before you do the 2nd CI. Everyone has a different risk/benefit analysis.