You can also have centralized factories that produce thousands of boxed lunches per day. Japan does this with ekiben for example

Is this not the same as microwave dinners and sandwiches at gas stations but with a Japanese accent

but automation and collectivization of cooking (and the domestic sector in general) is desirable

Agreed, but it'll be probably just be restaurants and cafeteria style imo instead of industrialized food at the scale of OP's video