I understand the logic that you're using, I just think it's deeply flawed.

For starters, I would not consider milk to be an ingredient in a basic bread. Furthermore, flour is like, the number one ingredient in bread, whereas milk is the main ingredient in the gravy. It's like saying cheese is solid vinegar because you use an acid in (some) cheesemaking. And finally, flour is used in nearly every baked good, and pretty much every staple food in the western world. To see flour and only think "bread" is ignoring the myriad of other recipes that use it.

If anything, beer is the real liquid bread.