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To your initial post - you have stated our current model correctly, and their (scale) limitations.
I could believe that gravity as we perceive it is more a property of complex geometry than a seperate, distinct force. So that is simply an abstraction that what we percieve as gravity is an indirect occurence of our reality that appears most commonly as a force.
A reason why relativity and quantum mechanics doesn't work well - is that relativity is scale invariant - it makes big assumptions on scale that don't well stand our test at either an atomic scale (or below) or glactic super cluster sizes and above.
Scale relativity is a newer model (under development) that posits that the universe isn't quantised into Planck units, that rather at very small scales spacetime is fractal (e.g. 2.68 not 3 dimensional). Quantum positions and irregularities can be modelled as movement along fractal paths in spacetime (vs movement through an exact grid).
Personally I think the science of this generation will build breakthroughs based on discoveries about the geometry of spacetime, as well as those substances and forces within it. Geometrical construction of the spacetime field may add to our understanding of the universe (and of course pose more complex, fundamental questions to resolve)!
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