I am skeptical about the “strong encapsulation”:
The newest traditional languages (such as Modula 2) bend over backwards to ensure that modules hide internal routines and data structures from other modules. The goal is to achieve module independence (a minimum coupling). The fear seems to be that modules strive to attack each other like alien antibodies. Or else, that evil bands of marauding modules are out to clobber the precious family data structures.
This is not what we’re concerned about. The purpose of hiding information, as we mean it, is simply to minimize the effects of a possible design-change by localizing things that might change within each component. - Thinking Forth