Matter of preference for crust styles. A lot of people like the NY Style chewy crust. Sauce and Topping is common with other Pizza styles.
Chicago Deep Dish is truly unique. In Taiwan Best Pizza Places go with the medium thickness crispier crust mostly. https://bigseventravel.com/best-pizzas-in-taiwan-2020/
Ever try making a pizza with a Baguette. Canned Pizza Sauce, cheese and sliced pepperoni ?
Yes most of them like doughiness and hearty toppings combo to get full, flavorful toppings go with certain crust is a good balance. People tends to share couple 12"s than eat one by oneself that makes pizza more a get together / party food, they are not used to keeping leftover pizza in fridge eat it cold or heat up the next day so their some 6 to 8 inch deals for one person . Thin crust pizza is considered snacks by many, those dont like factory made crust from Pizzahut/ Dominos get theirs from the joints in your restaurant link, stone baked pizza is a thing here for pizza lovers there are quite a few.
You mean like butterfly cut a baguette make it an open face sandwich with toppings? sounds good as a quick version crispy crust pizza i guess. I have done pizza of deep fried 1" thick toast digged some central part out for crust after fried up poured pan fried/ oven baked toppings and sauce in it , well call that a fried bread><
When are you going on a trip to Asia?^^