You are assuming the FD's were switched OFF. I doubt that especially as the A/P was still in CMD, but not control. The pilot was in control of the A/P, but perhaps not the a/c. Are you saying that executing a visual approach onto an ILS (which you will surely capture before the landing gate) it is not a good idea to keep the FD's ON, look through them if necessary and then allow them to capture the approach in the final stages? It is not necessary as the raw data pointers would be visible, but it is not a requirement not use all facilities just because you are making a visual approach.