It's just to illustrate the point that pitch + power = performance. And end this stupid discussion if power is speed or path and pitch is speed or path. They both are speed and path, as they determine the performance together.
Nor would I like to fly an approach with a fixed pitch setting, to many power changes.
And anyway I bet you have no idea what your actual speed is during the flare, you just know it's reducing and approximately ok as you were at Vapp when you started your flare.
That's why we add factors on top of the in factored landing distance which is based on Vref.