If the externalist/internalist boundary is drawn differently than the argument assumes, the historical narrative of externalist dominance collapses into a taxonomic artifact rather than a substantive philosophical shift.

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Boundary (in philosophical context)(as used in philosophy of mind): A dividing line that separates two opposing ideas or categories—in this case, the point where externalism ends and internalism begins.
Externalism(Philosophy of linguistics): The view that the forms of actually attested expressions — sentences, phrases, syllables, and systems of such units — are the proper object of linguistic inquiry
Internalism(Moral psychology; used to characterize the relationship between moral judgment and motivation): The view that it is a logical or conceptual truth that some degree of motivation is internal to a moral judgment itself — that making a genuine moral claim entails being motivated to some degree.
Substantive philosophical shift(as used in history of philosophy): A real, meaningful change in what philosophers actually believe or understand—not just a change in how we label or organize ideas.

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