For added variety and personality: the option to select a unique style of walking for your zoi that helps show their personality
Imagine being able to create a male zoi that walks with a bop vs an uptight zoi with a skip in their step. Even a zoi with a limp, a super feminine walk, a lazy slow and lethargic style walk, a more pretensions walk and so on.
I liked the idea in TS4 but would have preferred it less goofy/cartoony and more realistic!