im always skeptical of any science that heavily emphasizes anything with the word 'quantum'. its still just a theory because its almost impossible to measure, and still can't solve for the gravitational field.
it's like when companies advertise their products as being made with "military" grade materials. for vets, that's a huge red flag
No doubt there's a lot going on at the quantum level that is just not understood. But there's still so much at a macro level that is not either. Most of the theories surrounding gravity have holes in them, and usually have a "if this exists it would solve the theory" type crutch, such as dark matter. Newtonian gravity is a good basic idea but breaks easily, Einsteinian gravity works better but still breaks. One day we might have a unified understanding that could become Law.