Personally I'd like to know the formulas for certain foods because lately there have been a lot of ingredient and process changes that have made the foods and drinks taste so much worse, and not just in processed foods. There's the overreliance on high fructose corn syrup, the switch from canola to much worse and more environmentally destructive palm oil, the rise of using acid concentrates instead of actual fruit juice, and so on. If it's not the ingredient changes, it's market consolidation that has killed the better product so the bigger one can survive, such as Cheez-Its killing Cheese Nips. If I knew the old recipes I'd make these things myself.