Sure, but there apparently wasn't enough of a dialog either. With a textbook, you're confronted with facts and explanations that you didn't ask about, or even knew to ask about. Don't get me wrong - my original recommendation to take an interactive course is still the best option in my mind, as simplifications made for the benefit of the learner often lead to apparent contradictions that an instructor can clarify. But at some point you do just need the set of raw facts to be able to work with these systems.