You realize that food photography for decades essentially did the same thing? No Burger ever served at McDonalds has ever matched the looks of their advertising, nor is the actual prop-thing that was photographed remotely eatable. There exists an entire form of mastery around this work.

Food photography is regulated; they have to show the actual product being sold.

They just pay a lot more attention to the presentation; pick the nicest bit of lettuce, the ripest tomato, place everything with care.

Stuff you aren't selling can be props, like Elmer's glue for milk in a cereal ad. It won't fly in a milk ad, though.