They were probably made with elementary school students in mind or rather, their parents or guardians.
Its early in the morning, and you have x number of kids you need to make sure they brush their teeth, get dressed, all while you need to get yourself ready to go to work. Chuck one of these in a lunchbox plus some other bits and they'll be thawed by lunch time.
It was made by 2 North Dakota dads at the request of their wives. It took just a couple of years for the idea to take off, marketing the product to scools. It was then sold to Smuckers in 2003.
So the pitch probably went something like, "you two are inventors, can't you make this easy sandwich.... easier?"