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I'm for making the mechanics obvious and easy for newcomers to learn. Because, for example, I've played for a year and a half, and still, features (which, in my opinion, are bugs) pop up that directly contradict common sense, as well as the physics engine.
In summary: the rules (and mechanics are part of the rules) of the game should be clear to everyone - if, of course, we want to make the game more "competitive".