Rice in Burritos... WTF?

What is this thing about puting rice in the burritos? In South America, rice and beans are common in lunch and dinners (mostly in luch, when you talk about Brazil.) But burrito is a snack. And for this brazilian eyes right here, seems reeealy bizarre to eat your lunch wrapped in a flour pancake. For starters, lunch in Brazil is the principal meal course in the day. Normally, everyday meals in brazil are as follows: Breakfast, Coffee and Milk with a french bread (it's like those sourdough breads, but smaller, about the size of a fist.) with butter. Some like toast, some like curd with fruits and other like the "pão de queijo"- P-ah-oon deh keh-ee-joh Is a small pastry made of manioc flour, eggs and cheese. A reeelay nice cup of coffee in the end.
In lunch hour, brazilians eat for good. Rice and beans are always (or almost always) in everyone's plate. Beef steaks, grilled chicken, french fries, fried eggs, sausages (actually they are not sausages, they are raw....we call it lingüiças - Leen-gwee-ssahs). And we eat big time.  In dinner, it's a small meal... Actually, is like the breakfast (though, some like to eat a meal just like lunch.)
That's why i am soooo damn bothered by this. It's like to have the lunch in a snack hour. Well, it is said. Die Rice and beans burritos, die.