I would sugest that most experianced pilots do it because they have developed a "seat of the pants" feel and are making allowances for the slight changes during the landing. ( I know I do it) I think the student is taught to bring the stick smoothly back until landed as a way of landing the aircraft until they themselfs develop the "feel" for it.
I found that bringing the stick back smoothly works great in ideal conditions, but how often are the conditions perfect?.
just my own observations...... I could be totally wrong, and my landing method, something that instructors would smack me for.