You're missing a big point.  Metaphysics is an area of study.  Rational inquiry is the means best fit for the study of that field.

Physics is an area of study.  Some areas of it are best studied with true scientific method.  The more advance areas of physics are studied with a combination of data gleaned from experiments coupled with intellectual exploration using the means of rational inquiry.

Social science pretends it's a physical science.

It would benefit greatly from a re-introduction of the methods of rational inquiry, but most social scientists are too dull to understand that, and prefer to chase after some "p value" inventing new terms terms when the results can't be repeated!!