True, but the amount of "some" in each category is really important. The vast majority do not have problems with devices or implants of various sorts (I'm not just talking about CIs) in their bodies. It's not like it's 50/50. For a given individual, it's either 100% fine or it's absolutely not fine and has to come out.
But taking into consideration the whole universe of people who have had surgeries requiring some sort of plastic or metal or other product in their bodies, if you know that better than 99%, say, have no problems, while less than 1% do, wouldn't that make a difference in your thinking versus, say,
20% are successful, versus 80% unsuccesful?
I'm just saying it's important to know what those numbers are, success vs. failure, before saying "anything foreign in the body is bad news."