Comment by ivan_gammel

Well designed non-trivial libraries should be open for extension and thus should not hide most of the implementation details, leaving the risk of too tight coupling to users. E.g. if I‘m not 100% satisfied with some feature of a library, I should be able to create a slightly modified copy of implementation of some class, reusing all internal utilities, without forking it. So no, modules as means to reduce visibility are not as cool as you think. And given the specific example of the list, it’s possible to filter out irrelevant suggestions for auto-complete or auto-import in IDE settings.