If the gravitational field remains classical while sourced by quantum expectation values, the Schrödinger equation itself becomes nonlinear, violating well-confirmed quantum principles.

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Classical (physics)(as used in physics to contrast with quantum mechanics): Physics that follows the everyday rules we observe in the large-scale world, like objects falling or planets orbiting—as opposed to quantum physics, which describes the weird behavior of tiny atoms and particles.
Gravitational field(physics and Einstein's theory): The invisible influence that gravity exerts throughout space, bending and warping it the way a heavy ball creates a dip in a stretched rubber sheet.
Nonlinear(as used in mathematics and physics): A system where the outputs don't change in simple proportion to the inputs; small changes don't necessarily produce small effects.
Quantum expectation values(as used in quantum mechanics): A prediction of what you'd most likely measure if you performed an experiment on a quantum system (a subatomic particle or atom), based on the math of quantum mechanics.

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