Bejan says, "flow is such, that next time around it is easier". Obviously this observation does not come from fundamental physics, because there is no next time around in the basic Laws of Nature, so far postulated by physicists. Bejan is talking about emergent properties.
I am reading Leen Decin's beautiful review "Late Stages of Stellar Evolution - Herschel's contributions", one learns there, about the emergent complexity discovered with the space observatory Herschel.
Even the small galactic magnetic field, one thousandth of the Earth's field, gets into the natural game of making, "flow easier".