The short answer is that he didn't invent them.
Yes, the use of chopsticks is customary in Japan.
"Chopsticks are a pair of small, thin sticks used for eating Asian cuisine."
rice and chopsticks
Chopsticks.
Koreans are asians and most asians use chopsticks to eat their food.
People used chopsticks because they were easy and cheap to produce and buy.
no... how about soup? unless you have those chopsticks with the spoon ends on them...
Chopsticks.
yes
No, don't be ridiculous.
Well how many you would grab use but you just use the same pair.