All about marketing: this is big business, so a lot of money is spent pushing the convenience life style.
I have a difficult time relating to this however since cooking is a favorite activity of mine and my wife. We just got home from a trip so yesterday I made up a shopping list of fresh food that my wife picked up and in the afternoon I made Pad Thai with 6 different fresh vegetables from our garden and our local market.
Cooking is a lot of fun, and I can't understand why people can not make it a priority.