People are stupid  Bottom line is you need this. Think of it as a mule. It carries things so others (apps) don't have to. It carries things others (apps) on a trip will need food (commonly need packages)  water(more commonly needed packages)  etc.(even more commonly needed packages)  So others can carry just what they need(application specific packages). Just because you don't know doesn't mean you should rate poorly.
March 15 2017