"The books" are also describing a power-off approach -- a flapless landing will then be shallower and faster.
However, especially in IFR conditions, we strive to maintain a constant glide slope, so we adjust power to compensate. We "always" fly the 3 degree glide slope, but may be faster or slower depending on weight and flap configuration. As the others pointed out, the sight picture may vary with the airplane and flap setting.