OOP is sold on the promise that everything is modular. Since everything is neatly encapsulated with clearly defined API surfaces, you can easily swap out any pa

OOP is sold on the promise that everything is modular. Since everything is neatly encapsulated with clearly defined API surfaces, you can easily swap out any part for any other. This should make developers interchangeable, because anyone can go in to the code and swap out parts as needed. In reality this seems to make coupling even worse. Now you have to dig 8 classes deep just to find the business logic for a particular feature. Changing it is even harder because the rest of the program expects this part to behave in a very specific way.