Dear Than Tin,
Yours is a very powerful essay, beginning with your examples illustrating the importance of duals, followed by instances of use of these duals in analogy. It certainly captures the essence of the way we think, which you summarize as figure/background.
You analyze energy costs of the separation process and seem to conclude that zero energy would make the world chaotic and magical. On the other hand, some feel (as I do) that the 'Big Bang' was a zero cost event with the kinetic (positive) energy of the out-flowing substance exactly equal to the (negative) gravitational binding energy of the whole. You discuss the balance Nature must make. There is one problem with viewing Planck's constant as minimum energy. It is not energy, but action, which is (energy) x (time). That is a very big difference, and if you spend time thinking about it you may find it is even better at balancing the "freedom versus determinism" and taming the chaos. In other words I think it supports your argument.
You note the different formulations and interpretations of quantum theory, specifically concerning its wave-particle nature and entanglement. I have addressed the wave-particle nature in an earlier FQXi essay, and attempt to shed light on entanglement in my current essay, which I hope you will read and comment upon.
I very much applaud your approach to grasping the whole.
Edwin Eugene Klingman