Yes all of that but businesses first duty is to their shareholders. Not their customer. Not their staff. So aiming at a product with the lowest price ingredients aimed at a large but the least discerning sector of the market is good business strategy and fulfills their legal obligation. Why waste life trying to change that?
If people have taste buds attuned to those products they can go anywhere, grab anything and be satisfied. Is that not easier than trying to find something tasty outside the limited suburbs served by a good deli? Think on the taste of bread or fish and chips. It is possible for bread to be relly tasty but it is best for me to forget that and focus on the other stuff. Cooked fish and deep fries done well can be delicious but comparing the meal produced by someones local chippie with fresh caught fish, minimally fried and served with fresh ingredients is not going to go down well. Then there is the question of what time frame are you talking about? You are opening a can of worms For the past decade + that long standing traditional British dish Chicken Tikka has been a top five national favourite. Outside the papers than favour the great British roast and fish & chips curry is often the most popular best meal. I think this selection is a good cross selection but I have tasted some awful spag bogs and few (if any) that taste better than my home made. I have never ever enjoyed a toad in the hole
http://pocketcultures.com/2009/04/27/britains-10-favourite-foods/ but I am sure someone somewhere makes it well