Ill play a little devils advocate here. You ever try to take multiple product shots of some foods and have it look good for the whole photoshoot? Cereal especially, its gunna get soggy, the milk will have bits of the cereal that have broken off floating around or itll start to get discolored. Not to mention that milk will be sitting under hot studio lamps for at least as long as the photoshoot goes which can go on for a grip there will be thousands of shots from multiple angles, same shots with the lighting moved around and changed and not to mention the photoshoots are usually of multiple products or the same product with different platings/bowls/etc so theres gotta be an inventory of of these products ready to swap out without them being disturbed. Photographers that tend to do the big stuff also tend to be very passionate and very serious about it as photography is an art form after all. As a consumer I would prefer honest representation of the product to be shown but as a photographer I do understand wanting to get the best look of the product and I know my 3am 2nd bowl of cereal isint ever gunna look like the picture on the box.

Fun fact: Ice that is usually always depicted in beverages is not actually ice but rather a gelatin or some other gelatinous material that wont melt under the lights this is true in movies too because you dont want ice clinking in glasses while actors are trying to have a conversation. And the frosting effect you usually see thats not CG effects is usually some form of aerosolised glue. Its actually fascinating all the effects that you can do to make stuff look a certain way in studio conditions without the use of CG