[SoftwareMaven]

Your argument assumes that you need language-enforced mechanisms in order to define a well-encapsulated API. That is simply not that case, as the many well designed APIs in Python, Ruby, and Lisp can attest (and many poorly designed APIs in Java as well). You can use documentation, conventions, and other mechanisms to define the publicly exposed API so one doesn't have to know the guts.

But when I need to deviate from that API, for whatever reason is important to me but not to the library designer (from a bug to a weird environmental issue specific to me), if I can't get done what I need to, the language is getting in my way instead of helping me.

[MartinCron]

I totally agree that language-enforced mechanisms aren't the only way to get meaningful encapsulation. People can (and do) write good code or bad code in any language.

I was just trying to point out that there are both benefits and drawbacks to language-enforced encapsulation and the benefits may be less obvious than than the drawbacks, which are generally more painful.

[SoftwareMaven]

You have a good point there. You generally have to think about what you are exposing if the language demands it. And I think it is great when a language guides you into doing the right thing. Guides being the operative word.

Given the choice, I'll choose consenting adults. :)