Otherwise, it can be whittled down to the beauty of Kodak's instruction manual. Their manuals did not advocate any creative picture taking like those for foreign cameras; they simply told users to take pictures in bright sun, with the sun facing behind you. If you have played around with a light meter during the day, you'll notice that most traditional "snapshot" situations are ± 1/2 stop from sunny 16. As long as the user followed the instructions, he or she could get adequately exposed images at least 70% of the time.
Or maybe your parents threw out the bad ones!