As far as Apple is concerned they licensed a third party technology to monitor and diagnose troubles with cell reception. They collected anonymous data so they independently from the carriers could monitor how good their phones were. This is why Apple _knows_ that "antenna gate" was a technological nonissue since they had _facts_ backing their claims up, as opposed to all others, claiming the opposite.What's the point of this crappy Carrier IQ? And why was it kept a secret?
Apple probably could've conjured up this technology themselves but why bother when there was a readily available product that met their requirements.
I can assure you that there are several other logging and diagnose systems in place in iOS, and in Mac OS X. As are there in all other operating systems. Those who report back are option most of the time, as in Apples case, and most doesn't seem to care as this is a good thing for quality control of any software product. I see absolutely no reason for Apple to disclose the nature of these types of components in the operating system IF what they claim is correct in regards to what they collected, that it was anonymous and that it is indeed opt-in.