Breakfast for Dinner

We have very specific meals in America. In the morning between 6 and 9am, we eat breakfast. That could be eggs, bacon, cereal, bread,yogurt, fruit, etc. Between 11am-2pm we eat lunch. That could be a sandwich, soup, potato, fruit, yogurt, etc. Between 5-8pm we eat dinner. That could be foods ranging from meat to a sandwich. That is the "golden standard" for what time, and what we should eat. Then on Sundays, all of a sudden brunch exists. Where you can eat breakfast or lunch foods. You can eat sweet foods and bitter foods. But only on the weekend does brunch happen. Why is it that we have created these very strict rules for when we are allowed to eat a meal, and what foods we can eat at certain meals. Personally, I love breakfast foods. I think that they should be served at every meal, three times a day. Breakfast foods top all the other meals. French toast, pancakes, bacon, eggs, toast, and potatoes are the best. But somehow it was socially unacceptable to consume breakfast foods at any other time of day than breakfast. But then, this revolutionary idea was invented where, sometimes, you can eat breakfast for dinner. This is the most brilliant invention. It is socially acceptable to eat breakfast foods at another time of day. What I wonder is, why do we have to call it "breakfast" for dinner. Why can't this meal be just like any other meal. Why are certain foods defined as breakfast foods, some defined as lunch foods, and some defined as dinner foods? Then, who determined that there are some foods that only fit into the "brunch" category? Why are some foods only appropriate for consumption on the weekends between the time of 9am-1pm? Who made these rules? Why did someone make these rules? What is the point?