I think his point is comparing how easy / intuitive each interface is to learn. Besides, UI is supposed to be an aid not a puzzle.
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Intuitive/easy to learn does not imply useful. Some times the most useful things are the ones that have a high learning curve. It seems the tech industry has decided that making things easy is more important than making them useful.
That's because it is when you want mass-market adoption.
And UX design is only about making things easy to use. If they're not,the design is an utter 100% failure.