I have never made a power adjustment to stay on the glidepath whilst flying an ILS approach, always a tweak of elevator does the trick.
As for the original post, the throttle adjusts the noise level and the elevator alters how much land/sky you are looking at. The debate will go on but once you have learnt how to fly and start flying by feel you will do things automatically enough to not really know what does what, you do what needs to be done.