Let's take an example, mayonnaise. If I am raiding the fridge for a midnight snack, I need to have some solid info. If I discover the date on the mayo is old, I need to know if I can use it on my sandwich, otherwise...dry sandwich. Sure it is past the date, but will it make me sick or is it just going to lose some flavor?
Here Food Keeper cannot really help. It has like 15 words on mayo. USDAFoodKeeper I currently use called Still Tasty has the basic info followed by a page of details, including how to tell when foods are really dangerous, and info about best by dates, etc...
The point is when it comes to food, it's a sin to waste it and even worse to get sick from it. Who has the time to deal with food sickness and at midnight I am not going to market.
Food Keeper just does not provide the info I need. Basically, it is just way too simple and leaves too many unanswered questions.