Center, and Clearance Delivery should be added, it adds realism and allows controllers to vector aircraft to prevent collisions even if they are not near an airport. Clearance Delivery would allow the pilot to expect what their altitude after takeoff would be, the weather, what heading to fly after takeoff ect.
I don’t really think this is the best title for that, because before I clicked on it my first thought was “Well, there’s literally nothing we can do about that.”