"It's not a sandwich, your honor! I don't have to adhere to the US FDA safety regulations for sandwiches!"
A court of law saying, "It is simpler, easier, and more beneficial to consumers that laws written for 'sandwiches' apply to hot dogs" is, itself, a utility argument. It's not about simplicity of description, it's about simplicity of regulation. No need to redouble effort when the same safety and food-purity laws apply cleanly to both things.
But I agree the government is probably far less interested in culinary utility, and far more interested in not creating separate rules for every minor variation of bread + stuff.
Exactly.
To the average speaker, a hot dog is not a sandwich; if you refer to a hot dog as "that sandwich," e.g. by saying, "can you please hand me that sandwich," most fluent English speakers would get at least mildly confused. Most would ask you to clarify: "Did you mean this hot dog?" This implies people get that hot dogs and sandwiches are similar/related, but not so much that they're totally interchangeable in all circumstances.
To a judge, civil servant, legislator, or lawyer? The similarities far outweigh the differences. But this can be true even if things are completely NOT the same, or are things most people would definitely reject as being called "sandwiches," such as tacos (which, yes, there is a legal precedent out there somewhere that tacos are classifiable as "sandwiches".)
Finally, both your metric and mine reject the idea that coffee is a soup. It is a steeped and brewed beverage.
Instead, I offer you this tidbit: Broth is meat tea. You steep meat in boiling or near boiling water in order to extract nutrients from the material, which is discarded when the steeping process is complete. Various forms of instant "meat tea" exist, and dried material can be reconstituted to make it quickly. It's sold in both full liquid form and concentrated/dried form. Legally there's not all that much different between them. It just
feels weird and uncomfortable to say that you're "steeping" meat and bones to extract their flavor and nutrients.