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The Anthropic Principle
The details of quantum gravity don't really affect how a large massive object in a quantum superposition would gravitate. We can measure the gravitational field of things with Avogadro's numbers of particles, macroscopic things, measuring grams or more. But that's never going to keep something free from decoherence and collapsing its wave function. To actually have a macroscopically large self-gravitating system being a superposition of being in two different places is very, very difficult to even imagine doing any time in the foreseeable future.