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Aren't the fundamental interactions better thought of as between mass and spacetime (i.e. mass<->spacetime<->mass)? Shouldn't we be looking for a quantum form of spacetime? Or maybe at least two kinds of gravitons? (A mass->spacetime graviton and a spacetime->mass graviton.)

In other words, if gravitation is no more fundamental than the centripetal force, why are we looking for a quantum form of gravity?