>There's actually quite a big assumption in here -- namely, that the truth is constant over time and throughout space. The current models include these assumpt

>There's actually quite a big assumption in here -- namely, that the truth is constant over time and throughout space. The current models include these assumptions for the same reason they include any other assumptions, because models where these assumptions aren't included don't do any better a job explaining any experimental results. If new experimental data shows these assumptions fail in some cases, then the models can be updated to handle them, same as any other failure has been handled in the past. (Granted each step becomes computationally more complex, so eventually we might hit a limit where it is too complex for a human to understand well enough to operate on.)