@wannarunfromitall that a bacon and cream sauce exists, but it's not called carbonara. He'd be wrong- as seen below (translated from Il Gambero Rosso)
"Most of the anecdotal origins of the dish are just that- it's an urban myth that the dish was invented to feed coalminers, hence the pepper. The name "carbonara" was first used in a film in the 1950s but referred to amatriciana not carbonara and the first published recipe using eggs, guanciale and cheese wasn't even Italian. An egg sauce with pasta recipe dates back to the 18th century- but no bacon or cheese, while a bacon and cheese pasta, but no eggs from 1949.
Trigger warning for the anti-American faction (and Romans)- the first published recipe for Carbonara as we know it was in Chicago. Three years before the first Italian one. 1951 and 1954 respectively. The first published recipes sometimes used garlic and gruyere.
Guanciale replaced pancetta in the 1960s. Cream was typically used until the end of the 1980s. At various stages: wine, red peppers, onions, chili and garlic have all featured in the "traditional" and "authentic" carbonara recipe.
Only in the last couple of decades has it been reduced to eggs (with 1 extra yolk per person on top of the original 1 whole egg) guanciale and pecorino."
I suppose it's like mincemeat. Or the urban myths that everyone in England has a full English every day and stops for tea and cake at 4pm. There is a grain of historical truth in there, but most of it is, and always has been anecdotal. Also I imagine because of a lack of written, prescriptive (or) proscriptive recipes for everyday dishes.