There is no pre-set menu. Rather the chefs' themselves determine what they will make each day. When one chef has an idea, she contacts the other chefs to see if others are interested in making that dish. So, the menu evolves and changes. Chefs can use the skills of other chefs there to help them take their initial idea and develop it.
Every chef has some unique skills to contribute.
The collective kitchen does not replace their other work. What they learn from the other chefs in the collective kitchen will help them be better chefs in their private kitchen as well. Chefs come and go from the collective kitchen as they like. But, in this case, they can't expect the other chefs to necessarily help out, and they can't use the amazing equipment in the collective kitchen for such a competitive purpose. When working together, chefs can use whatever equipment is in the kitchen.