It's only 'standard' in case of non-removable lenses - DSLR class optics from Nikon, Canon, etc still (commendably) lists 'native' focal length, regardless of the camera, exactly because it would more confusion if they followed 'equivalents'.

BTW And since we're hair splitting, let me split it a bit further - equivalents account only for crop, but not DOF so it's not 'exact' equivalent, either.