I don't think anyone has a problem with the chain of command.The capitan has ultimate responsibility/say ,in any matter on board,but how can someone who is responsible for the flying of the aircraft become involved in the run of the mill day to day opperation in the cabin that is why the responsibilty of running the service is delegated to the sccm. CabinCrew see very little of the flight crew during a flight thus for them their manager is the sccm,however they know that the person at the front is the capitan of the ship and has ultimate say.
I would say that it is appreciated by all when the cap.comes to the door to say goodbye to all the passengers.