It is good that they define foot, inches, etc by SI units, because SI units are well-defined scientific units (except, until recently, the definition of kilogra

It is good that they define foot, inches, etc by SI units, because SI units are well-defined scientific units (except, until recently, the definition of kilogram was no good), and for the appropriate purposes the foot, inches, etc can be reasonable measures (while SI units are good for general purposes, the others are good for the specific purposes), so now they are also well-defined units.