I saw a post earlier this morning mentioning using a skimmer in addition to the factory drains on an Intex-type pool and then came across the YouTube video below. When I installed our skimmer on our 12' AGP I plugged off the factory drains and only used the skimmer. Should I keep the side outlets in the system like this guy did? I understand what he says about "why" and how he can choose which to use when. Is there any reason not to just use the skimmer?