Because they have been together for a while, Joan now has no problem using chopsticks. For non-Chinese people, the biggest reason for not being good at using chopsticks is a matter of habit rather than hand flexibility.
After all, eating with chopsticks is not such a complicated action, so practice makes perfect. Saying that some people cannot learn it would be too arbitrary.
On the other hand, the dishes of each country are actually matched with traditional tableware. For example, dumplings are suitable to be eaten with chopsticks, but it seems abnormal to eat them with a knife and fork. The whole steak is just the opposite.
The reason why Joan, as a European, learned to use chopsticks so quickly is that her previous dining habits were to use her hands directly without any tableware. So, she didn't have any habits in using tableware.
