Models, all models, are simple relative to full-blown complex systems. They are really just analogies and metaphors for the behavior of the system. It is very important to do simple models, oscillator models of climatic behavior. Then, though, you add complexity, you build up the hierarchy, and you find out how each addition of incremental change alters the emergent properties of your answer, the results of your experiments. Through that process you are building up your understanding. You are rendering your models more sophisticated, more real-life-like.