Initially, it may seem like a lot of needless overhead to split up the application this way. We'll have to shuttle data around between different objects and ultimately write more code to do exactly the same thing. Why would we do this?
Put simply, we're doing it to make expansion manageable. As the application grows, the complexity will also grow. Isolating our components from one another limits the amount of complexity that any one component has to manage; for example, when we restructure the layout of our form view, we shouldn't need to worry about how the model will structure the data in the output file. Those two aspects of the program should be independent of one another.
It also helps us to be consistent about ...
