The promise of oop is that if you thread your spaghetti through your meatballs and baste them in bolgnaise sauce before you cook them, it's much simpler and nothing ever gets tangled up, so that when you come to reheat the frozen dish a month later it's very easy to swap out a meatball for a different one.
It absolutely does not even remotely live up to it's promise, and if it did, no one in their right mind would be recommending an abstract singleton factory, and there wouldn't be quite so many shelves of books about how to do oop well.
Where are you from/living?