All departments are important in order to complete the given service - that is why they exist. If not, they would have been dispensed with long ago. You can't fly without F/D or CC but unless someone sells, books, plans, fuels, loads and dispatches the flight, it ain't going anywhere.
As cabin crew, I couldn't agree more. Getting an aircraft from A to B takes terrific team work from each and every department and
everyone is as important and valued as the next person in my eyes.
We all depend on each other to get the job done and
no-one is more important or special than anyone else.