Every country, every country has its own cultural habits, of course, affected by their own culture, their use of chopsticks in different forms. Chinese chopsticksare long, while Japanese chopsticks are short. But chopsticks were originally invented by the Chinese. When did it come to Japan, there was no relevant literature in the historical materials.
Chinese chopsticks are thick and long, while Japanese chopsticks are sharp and short. The main reason is that Japanese eat their meals. Usually they are served in front of them after a good meal. The length of chopsticks is no harm. Chinese people eat together, eat big pot dishes together, chopsticks do not grow well clamped. Korean people also use chopsticks, but stainless steel chopsticks are not wooden chopsticks. The advantage of stainless steel chopsticks is that they are easy to clean and save resources. I think the third advantage is that you can use chopsticks to knock bowls as accompaniment before and after meals. But Chinese restaurants in Seoul use disposable wooden and bamboo chopsticks. It seems that only wooden and bamboo chopsticks can taste Chinese food.