Decades of work are being put in trying to find a unified theory which can accommodate both General Relativity and the Standard Model. I guess that the attractive of a unified theory is more than justified, but does it really need to be the case? Is it possible that the universe works really with separate elements like a) GR describing spacetime which is continuous b) QM describing energy-matter which is quantized c) a theory describing how do both interact with eachother Something like in the game of chess where you have a description of the chessboard, a description of the pieces, and the rules of the game? It may look like 'c' is the same as the unified theory of the first paragraph, but in this case there is no need to search for a quantization of spacetime, spacetime would still be continuous, and 'c' would just be a theory describing how continuous spacetime and discrete energy interact with each other. Is this possibility also being researched?