While reading #1 here (which recommends using familiar user interface paradigms for learnability), I couldn't help thinking about Loewy's MAYA principle (most advanced yet acceptable) and this from Dieter Rams:
Things which are different simply in order to be different are seldom better, but that which is made to be better is almost always different.
We need to strike a balance, but would should keep Rams and Loewy in mind as we do so.