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That article had some interesting ideas, but I think the author sometimes blames interfaces for non-interface problems.
For instance at one point the author describes a hypothetical river-like interface, saying that "This means that boolean searches can be made entirely visual. Many people have a lot of trouble understanding boolean searches. "
In fact such an interface was described in 1992. Despite an obvious elegance, it hasn't caught on.
Why? The problem is that some users don't view the world in precise boolean terms. No interface in the world can solve that problem. And conversely, once you're thinking in terms of "and" and "or", a purely verbal interface is going to be easy.
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