3 hours ago, Katie Meadow said:As for restaurants in China, do diners not ask for a takeaway bag if there's extra food on the table?
Yes, many do, but they tend to be among private or family groups. Until quite recently, most restaurant meals were business or, more often, government funded "official" functions where over ordering and extravagance were routine. Then asking for takeaway was very rare.
A few years ago Xi Jinping, the current President, limited the number of courses to be served and banned the more expensive dishes favouted by the Party elite. Although that has had an effect, it still goes on to an extent, just less ostentatiously.