Those "unpredictable" rules make up everything we see on the macro-scale. The "ordinary rules" of everyday experience are derived from quantum mechanics. Otherwise, QM would not be very useful.

(BTW, the rules of QM are not unpredicatable. Sometimes the results are to a degree.)

I no what you mean, though. What would happen if, say, Planck's constant was 11 rather than 6E-34? Check out the Mr. Thompkins series of books by Roger Penrose. He explores that very question in a very humorous fashion. And the physics is all acurate.

I don't know. This world is great and all, but I think I would like the crazyness of the world with a large planks constant. Like in the Elegant Universe where they showned the "H bar"