OOP is all about code reusability until you really want exactly the code Foo with non-pure functions in all your classes. You end up almost rewriting all subclasses' properties into the superclass to silence typecheckers. Is there no "I know what i'm doing, please just transpile/compile this piece of logic into these 20 places I need?" You end up doing it the functional way, dumping refs and params into some shared util function and have it do the job. I know, might as well have that one inherited also, but what's the point of adding more mess just for that ?