because on final approach, where you will be most likely to handfly, he's wrong. On final approach, control speed with thrust, and pitch with the control column. Jets are not Cessnas. Actually the correct way to fly a Cessna is the same;
There are whole world's regions where the opposite is preached, in line with the original post. And it has served them well for generations.
Indeed, for a B737 (the global largest jet fleet) it is the easier way, due to strong pitch/power couple and non-augmented flight controls. I have no opinion on other types which would be relevant to this particular thread.