Japanese tea cup at sushi restaurants are big

Do you know why YUNOMI (Japanese tea cup) at sushi restaurants are larger than ordinary ones?? It is said that there are two reasons in this. One reason is that sushi chefs who running their restaurants by themselves in the old days thought that pouring tea many times over was time-consuming. The other reason is that people used to use YUNOMI like a finger bowl after having sushi with their hands. Of course, since there is a OSIBORI (wet towels) at all sushi restaurants now, please don’t plunge your hand into a YUNOMI 😀