Could you summarize the problem for a layman regardless of solution? I know the basic fact that relativity is a metric force, acting at the level of large aggregates of matter, although I know that special relativity is also applicable to high speed subatomic particles. And that quantum theory describes point forces, which reduce to exchanges of elementary particles that occur in certain situations. Explanations needing to end somewhere, I suppose each had axioms simply posited to be true that, together with an auxiliary hypothesis, imply the behavior of particles. In the case of relativity theory, I know that the axiom of the ether frame was abandoned as logically unjustifiable and incompatible with the Michaelson-Morley interferometer. In the case of quantum theory, I know not the axioms. I have heard wildly competing claims from knowledgeable parties, including that quantum their was internally inconsistent despite all the locally correct predictions. And that’s without being into the vague talk of interpretations weird and weirder. Its common knowledge there is an inconsistency between the two theories, but I doubt I am alone in not really having the requisite knowledge to know why a metric and a point particle force can’t both exist in this world.