I think you are absolutely right, autolycus. It's sychronicity of the whole system, not the detection of an influence or causation by various heavenly bodies. Any method of divination works for that very reason, provided the person doing it is sensitive enough to tune in. The degree of their sensitivity is the key to a good reading...NOT the method they use.

I've seen marvelously accurate readings done with tea leaves, for instance. One does not need astrology to do readings at all, but if one likes it, it's probably as good a method of divination as any.