I don't quite subscribe to some of the terms used (even though I see the point of not calling this API). Still I think this is a very good way to approach design, it's also why I like TDD, the tests force you to see how the code is used. If it ain't pretty there's a problem.

None of this looks like definitive research results on the topic. Still, there are quite a few weak signals pointing in the same direction.

Now this is a really strange story... amazing how she managed to be so successful and stay under the radars for so long!