At the last Parliament of Hippies I attended, the soup - salad - sandwich triangulation was proposed, with Salisbury steak at the exact center, being an open face breadless sandwich, a kind of solid heavy stew and a meat salad with dressing.
Consider the general case of “sandwich” ie one thing between two others. A properly made hotdog does not meet this definition because there is only one piece of bread.
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https://whatscookingamerica.net/history/hoagiesubmarinepoboy.htm
Subs are sandwiches. Just like a bacon butty in a teacake that’s not cut all the way through is a sandwich.
Tacos are just shit. They don’t need taxonomical status.