• If Oracle AI is used to construct complex designs, it needs to be more than a predictor, for the space of possible designs is too big, for example the designs need to be understandable by people who read them.

You mean you can't think of scenarios where an Oracle prints out complex human-readable designs? How about you put the Oracle into a virtual world where it observes a plan to steal those kinds of design, and then ask it what it will observe next - as the stolen plans are about to be presented to it?