That's because that's a decision they made for themselves. I know -- I considered one myself. I went through the entire process and stopped short at the ENT/MRI stage because visits with my CI audi determined I would not get enough benefit out of it that I already don't get with my HAs. I shared my journey with that process on this forum 2 years ago, including test results that showed what I just said. Anyhow, I've been deaf since birth, been fully immersed in ASL, the deaf culture, learned to speak, etc. and I still considered a CI. It is the same for the others who chose a CI for themselves. I wouldn't have dropped deaf friends, wouldn't have stopped using ASL. It is all a part of my life.
So, what is your point about those choosing the CI route for themselves?