OO design is ultimately API design. Unfortunately, it's often taught with toy noun examples that have obvious/actual internal fields and data structures. It'd

OO design is ultimately API design. Unfortunately, it's often taught with toy noun examples that have obvious/actual internal fields and data structures. It'd be better taught solely using abstract nouns, to better nudge learners into explicitly thinking about external/API design vs internal state. Or, in other words, getters and setters are subcases where the external/API exposed is 1:1 with internal state.