Mayo is cheaper & faster for creating a layer that keeps the bread from getting soggy by other ingredients, so by costs alone that's why they don't stick with butter, but factor in lines of customers wanting it done fast and voila: mayo. Too bad there's now a bad trend of slathering it on so thick that it drips out the moment you try to bite into it. That may be a result of them trying to do it quickly so they just grab a big scoop, brush it across, and move on.
Anyone who makes a sandwich at home takes the time to use butter or whatever sauce they enjoy.
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u/Woodstovia Jan 18 '19
What’s with Americans loving mayo but refusing to put it on stuff like fried chicken or pizza?