You're right John, Optis aren't specifically mentioned, I may have read into this too much "very young kids."
A very young kid (to me) is a six-year-old. As mentioned by others here, Optis have all sorts of advantages that we need to overcome (they are slow, crash-resistant, and "self-righting").
True, we don't HAVE to overcome this, or target six-year-olds. But, it would take a very blind person not to see that in most areas (and there are some good exceptions), the Optis feed directly into the next mono class, and not into cats.
That's why I think it's critical to have a cat that a six-year-old can sail, to bypass the Opti completely. It needs to be WAY slower than we would want to sail as adults, yet still be exciting enough to entice kids to sail.