What do the kitchens 2 and 3 in the Fantasy Westward Journey house have to do with cooking? And what does Feng Shui have to do with cooking?

A house with 3 kitchens is much more likely to cook double portions than a house with 2 kitchens. If you cannot cook 3 portions, you can cook double portions at home at most

Feng Shui and cooking will produce double portions. It is related to the probability, and it is also related to the experience of training the baby at home, the life span of feeding the baby, the number of breaks, the amount of physical activity during rest, etc.