Shrink Wrap

Why is it that the shrink wrap over food items is so difficult to remove, but the stuff around cleaners is not? To open medication all one usually needs to do is push down and turn. To get into a tub of ricotta cheese there is a thin layer of plastic. To remove that one must pain-stakingly peel back the non-existent edge. Why should eating food be so difficult, but any non-edible item be so readily available? Aah the baffling wonders of technology.