All as about "quantum gravity" as about "the interpretations of quantum mechanics" shows only our misunderstanding of what quantum mechanics means and wants to tell us.
Its "complementarity" is especially misleading without being wrong: It hides that wave-particle duality is also wave-particle invariance in the same degree. Our ordinary everyday intuition distinctly separating waves from particles is what misleads us. In fact they are the same in principle and this is what means the formalism of quantum mechanics based on complex Hilbert space.  
The anti-isometric dual spaces (Riesz representation theorem) provide the characteristic functions of any two conjugate quantities as random ones be represented as the two corresponding points in the two dual spaces and be able to consider them as the same or even as a single point making the other into "redundant". 
The "no hidden variables"  theorems (Neuman 1932; Kochen, Specker 1967) prove it: The second, dual aspect as well as the conjugate quantity is merely redundant.
Reversely, any theory of gravity should describe mathematically the wave-particle asymmetry on that level of observation where it appears: That is: the scale, on which a "wavelet microscope" would self-adjust to the strongest "signal"; the space-time point and its contiguity, about which the space-time curvature would be the biggest; the scale where the mass exponents of the measuring "apparatus" and of the measured entity are the same or eventually very, very close.
Said in a few words, entanglement is gravity as well as gravity is entanglement. General relativity and quantum mechanics are dual, complementary. They describe the same on too different scales.

v. Neumann, J. 1932. Mathematische Grundlagen der Quantenmechanik. Berlin: Verlag von Julius Springer. (J. vonNeumann. 1955. Mathematical Foundationsof Quantum Mechanics. Princeton: University Press; Й. фон Нейман. 1964. Математические основы квантовой механики. Москва: „Наука”.)
Kochen, S., E. Specker.1967. The problem of hidden variables in quantum mechanics. – PhysicalReview A. Vol. 17, № 1,59-87.