the RAF isn't trying to destroy the FAA, it simply believes that it should be responsible for providing air power.
And providing fixed wing air power from the sea is a specialised skill which cannot just be picked up and dropped as required.
The RAF are not best positioned to do this.
We need to bring the Carrier / Maritime Airpower / Strike experience which is currently being built in the States with the FAA into the UK F35 programme by way of the FAA/RAF mix currently proposed.
Of course the RN view it as maritime air power therefore slipping conveniently into the RN (FAA) arena
Because it is.