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I doubt if we'll tamper with Dart's privacy rules, especially in this particular way. In a dynamically typed language, class privacy is difficult to enforce efficiently. You could have object level privacy though.

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We've discussed this off and on for a long time. Our feeling is that it is hard to implement efficiently when you are dealing with dynamism and doesn't add much value. Libraries are the level of encapsulation in Dart. A class in one library shouldn't need to hide stuff from another class in the same library. If it does, you can always move them to separate libraries.

Yes, this takes some getting used to when coming from a more class-based language like Java or C#, but I think the result actually works out really well. There are some other variations on privacy the language team has talked about (protected, object-privacy, et al.), but we're happy with not supporting class privacy right now.