Quinean naturalism does not have an exclusive lock on useful philosophy, but it's the most productive because it starts from a bunch of the right assumptions (reductionism, naturalized epistemology, etc.)

Like I said, Quine was wrong about lots of things. Behaviorism was one of them. But Quine still saw epistemology as a chapter of the natural sciences on how human brains came to knowledge - the field we now know as "cognitive science."