I know you are just trying to use what you learned in a college class, but we use appeal to authority every day, in every facet of life.
FDA tests the red berries for safety, they are certified as a safe food source and sold in grocery stores. Your neighbor ate some of those red berries and got deathly ill, and tells you not to eat them. Who do you believe?
Eddie Van Halen designs and uses an amp on stage through the final decade of his career, and he is knows to have great touch sensitivity. Some bedroom guitarist says the amp doesn't respond to his right hand technique. Who do you believe?
Appeal to authority is fundamental to how we as a society operate. It guides our decision making.