it seems to me that if we ever figure out the actual structure of the universe then the question as to how and why gravity and 'c' propagate at the speed they do will be self evident.

like knowing why the speed of sound is what it is. we fully understand that a mechanical wave propagation speed is a function of the density of the material through which the wave radiates. by understanding the component in the system that allows the wave to traverse through the medium, we have a much deeper understanding of the nature of the material in question and can even extrapolate and build models that predict the structure of an object. all this because we understand how/why a wave travels through a material.

i would further postulate that if we understand how/why the speed of light is what it is then we would have a deeper understanding of the physical universe for which we live in.

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-work in progress--