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It boils down to the fact that Pure Mathematics has a well-tested (if sometimes rigid) methodology. Metaphysics may lack an adequate methodology. The role of methodologies in general is to determine what's true and what's false, and what's outright nonsense. Pure Mathematics may well be defined by its methodology.

I think that's close to hitting it on the head. The author makes it sound like metaphysics is distrusted because there is no clear way for it to put bread on the table, while in reality it is distrusted because there is no way to tell if it is true.

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