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Okay, Marcel, I see your philosophy is based on Aristotle's metaphysics.
That's fine; however, why would one be compelled to accept metaphysical philosophy over scientific objectivity, when your question is "How much more could we DO if we actually understood what it is all about???"
What does one do with a belief system? It isn't about doing. Take for example your belief that time is continuous. That classical notion requires a metric of reversible trajectory in contradiction to your "explosive evolution" which is a one-way process. Compare this philosophy based on belief to Newton's scientific pledge to "make no hypoothesis." Inevitably, one who bases one's conclusions on logic alone will end in contradiction, because so much (most, actually) of what we objectively know of Nature is counterintuitive.
The anlogies you make between physics and metaphysics are not true. We certainly do know the difference between gravity and inertia, e.g. -- the equivalence principle refers to the equivalence between gravitational force and acceleration, and follows from Newtonian mechanics. Newton had shown that the acceleration of an apple toward the center of the Earth and the acceleration of the moon around the curvature of the Earth are due to the same physics -- Einstein extended this result to the vacuum, away from the influence of a gravity field, where an observer without external reference cannot distinguish between acceleration in one direction and gravity in the opposite direction. The significance is classical symmetry -- reversibility -- which gets right back to the time continuum.
Jacobson's and Verlinde's entropic model identifies gravity with information entropy. Because the mathematical model of information entropy (due to Shannon) is identical to thermodynamic entropy, one finds that if the world is made entirely of quantum information (and how's that for a metaphysical premise?) then information entropy holds it together. This goes right against the grain of classical gravity and its reversible continuous field.
Now that you've given me your operational meaning for metaphysics and I see that it is Aristotelian rather than solipsistic, I understand. However, I based my question on your claim, if I understood correctly, that there is no objective universe (which would imply solipsism). There is an objective component to your philosophy, however -- Aristotle's rules of logic and pure deduction.
As I implied, science does not shy from metaphysical realism -- I think the Jacobson/Verlinde model is an excellent example. Can we do more with a purely metaphysical POV than with science? I doubt it, though I wouldn't dare sell short the metaphysical contribution to scientific motives.
Tom