It's on purpose to make the point that advertising serves a purpose. If advertising has hammered in to me that Tesco sells food and Screwfix sells power tools

It's on purpose to make the point that advertising serves a purpose. If advertising has hammered in to me that Tesco sells food and Screwfix sells power tools then my brain has a ready made map of what those chains sell. I don't have to visit and find out for myself.