Modal criteria that treat all necessary co-extensionals as joint commitments violate the Quinean principle that ontological commitment tracks existential quantification, not metaphysical necessity.

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Co-extensionals(necessary co-extensionals): Things that apply to exactly the same set of objects or situations; if two terms are co-extensional, they're true in all the same cases.
Existential quantification(in formal logic): A logical claim that says 'at least one thing has this property'—like saying 'someone in this room speaks French' rather than 'everyone in this room speaks French.'
Quine(as a proper name referring to the philosopher whose theory is being discussed): Willard Van Orman Quine was a 20th-century American philosopher who wrote about how we know things and how language works. In this statement, we're discussing one of his specific ideas about observation.
Quinean principle(violate the Quinean principle): A rule of thinking proposed by philosopher Willard Van Orman Quine: what you're really committed to existing should match what your formal logic says exists, not what seems philosophically necessary.

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