If you ask the average person what version of Android their phone is running, most of them would likely give you a blank stare. But what if you asked Jeopardy contestants the following question: "Marshmallow is the name of the 6.0 version of this operating system that powers millions of smartphones." Hit the link to hear their answers.
Really? How so? I guarantee you take a sample of 50 android users at random and at least 80% of them won't know the name (Lollipop/Marshmallow etc) of the OS they're using. Where does it tell you? In Settings -> About Device, it just tells you the Android version, why does a standard user need to know more than that? How would they know more than that?