Also, continuing to allow cruder levels can help to validate the more fundamental ones, or even falsify them (which would help refine the fundamental ones). If a description that bases its predictions on fundamental axioms turns out to be unreliable, that can point to a problem in the axioms themselves, even if they look flawless to us, it could be clear where the problem is coming from.
Also, continuing to allow cruder levels can help to validate the more fundamental ones, or even falsify them (which would help refine the fundamental ones). If a description that bases its predictions on fundamental axioms turns out to be unreliable, that can point to a problem in the axioms themselves, even if they look flawless to us, it could be clear where the problem is coming from.