Do netsuke artists have manual dexterity?

My father is highly skilled in his work. He is able to do minute and intricate carving. He can also expertly make carving tools which not many artists can do. He is also good at sharpening the carving tools, which others cannot do well. And yet in everyday life he is surprisingly clumsy at doing certain things with his hands. For instance, he always has a problem buttoning his cuffs. It takes such a long time that I end up helping him. Then he sighs and says “How clumsy I am …”