Quantum everything is unavoidable, because the world is Quantum.
When a non-Quantum explanation is advanced it has to be simple enough to be clearly non-Quantum. Yet, much that was thought to be very simple, turns out to be Quantum!
QUANTUM EFFECTS SHIELD LIFE ON EARTH:
Here is an example: the magnetic shield protecting which protects life originates, everybody agrees with something more or less molten iron at more or less the temperature of the surface of the Sun, does below our feet. However, researchers at the Universities of Washington Rutgers, Carnegie just revealed that some “Quantum correlations between electrons” were crucial. It helps generate twice the thermal convection that theory neglecting electron to electron scattering had found (the theory from 1930 had neglected the effect).