What constitutes knowledge is a practical first order need.
Once again you are confusing the acquisition and use of knowledge (definitely first order in terms of human survival) with the philosophical study of the
nature of knowledge. As interesting as the latter may be, you don't need to study the
nature of knowledge to be able to acquire and use knowledge.
I come back to my language analogy - early humans will have acquired and used language in a manner that had utility - without any need to study the
nature of language, i.e. linguistics.
You seem to be arguing the equivalent of saying that somehow you cannot have language and its utility until after you have linguistics. And that somehow linguistics, rather than language, is what confers first order survival advantage.