Point 2) feels very weak. You could easily have getR and getTheta, but critically you could also always have had them - if they make sense as APIs, and your sta

Point 2) feels very weak. You could easily have getR and getTheta, but critically you could also always have had them - if they make sense as APIs, and your state is encapsulated, you can expose them at any time. The benefit of having getters is that API consumers don’t privilege public state above any other API component, because they don’t know what’s actually the real state and what’s just under contract.