As an older American from the deep south, it's just a holdover from cheap high calorie/high carb foods to start the day back when America was mostly agrarian.
Then when the 50s rolled around it got combined with nutrition concepts of a "balanced breakfast" by cereal marketing firms and romanticized to sell even cheaper products to children/parents; sugared cereal.
For me, breakfast is bacon, eggs and biscuits or toast. And maybe grits if I'm feeling like it. I like hash browns but I don't like making them.
It's just leftover marketing. Eat what makes you happy.
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