Survivorship bias is when you are only seeing the successes.
> ...if my siblings an I were brought up just fine in the 80's without being in a "smart onesie", I'm sure we can do just as fine today.
There's no one here to say "I died because my parents didn't realize I stopped breathing". Yes, one can look at statistics, and see how many deaths would be prevented by this device, but the comment didn't do that. It's survivorship bias.
The main issues, though, are very small sample sizes and the difficulty of knowing if people really were "just fine" compared to what they would have been otherwise.