When there's a lot of specialized staff working at the same time. It would be nice to specialize them even more for added efficiency.
Example 1:
I have a chef with the ability to make food that spoils slower. I don't want to waste her talents on skewers. I want her to prioritize making bread, or even stew/soup. I want the other chefs to prioritize quick meals.
Example 2:
I have a server who can take multiple orders at a table. I want other servers to focus on serving plates or staffing bar counters, and I want her to prioritize taking orders at tables.
Example 3:
I have a dogsbody who lights safer fires. I want him to be responsible for hearths/stoves, and have the others focus on deliveries and taps.