Good post, Chris. As you say, every new caster (and 99%) of experienced casters I know think of your drawing B when somebody mentions 10 - 2. The obvious reason is because the hands on a clock rotate around a fixed point in the center of a circle.
Your other illustrations of good technique can work with a 10-2 analogy, but I think using clock face terminology would require the visual illustration to make sure that the student caster didn't misinterpret what was meant by the clock face talk. Without an illustration, everybody hears "10-2" and thinks of your drawing B. That's why it's been such a bad analogy through the years.