Technology is not the enemy. Apps are generally good. Self-serve gas (not in NJ!) and self checkout grocery and now self check out at some convenience stores. Order online with Amazon or drive to Best Buy, your choice. No one says you "must" use these options but when they are convenient, time saving and often money saving, why not use them?
I save at least $1 on nearly every McDonald's visit using the app and right now there is a $2 breakfast sandwich offer so I can get a bacon, egg, cheese, bagel ($5.17) for $2!