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Rich Hickey disagrees, saying that's complecting. In Clojure (and not only) the philosophy is that the data-structure survives more than the code that operates on it and it's wrong to tie them together. But I agree w/ you and I like my encapsulation.
I think that any analysis may be tainted by the experience that encapsulation very often appears alongside inheritance. When OOP doesn't work out, it's not always obvious which aspect of OOP is to blame (or if it's the whole shebang).
I often thought, without any evidence, that Scala's stdlib collections might benefit from being more pure data structures, with no inheritance, fewer methods, and additional operations provided through extension methods.
Problem is w/ all optimizations. E.g. List actually has an internal "var tail", used then in ListBuffer and in all methods for quickly building lists, to avoid the "reverse" operation. If extension methods end up using internal impl details, then they aren't extension methods.
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