The double slit experiment confirms the wavelike nature of the universe at macro scale. A completely stateful universe where a photon discretely moves through spacetime could not exhibit self interference, only if the photon takes all paths (suggesting 'functions' that describe its movement) could it then collapse into a discrete position after being observed (aka. evaluated)

What I'm getting at is that in between emission and observation the photon is not in any one state, at best it's state could be described as a superposition.

To take the analogy one step too far, perhaps worst of all this suggests a lazily evaluated haskellian universe with a giant state monad whose NUMA architecture updates at the speed of light.