I always practice landings with the throttle at idle. The reason for this is: deadsticks! I always start from a height that will allow me to make a good landing while glidng only. I also can do a deadstick landing perfect every time because of this. Every one of my landings is "deadstick". I personally think this is a good habit to get into. It develops the sense of potential energy that your model has. I do not like to "save the approach" with addition of power. This always makes me think "what if I HAD no power to add at this point?"