So you are not really arguing that human knowledge cannot be categorized.
In fact you are sort of arguing the opposite: Human knowledge lends itself so well to categorization that a single ontology is impossible (if it was really hard to categorize, there would be no or few ontologies).
In fact you are sort of arguing the opposite: Human knowledge lends itself so well to categorization that a single ontology is impossible (if it was really hard to categorize, there would be no or few ontologies).