Inevitable really. When I was a baby sparker in 1967 it took about a dozen operators, 4 Relay Stations, and about 3 hours minimum to get a bit of information from the UK to, say, Hong Kong. Nowadays you can, for example, pick up a mobile phone on Dartmoor and call a ship in the Gulf.
Modern MCOs were being automated all the time and even when I left in 1991 it was possible for one operator to run all of a FF/DD's strategic comms, hands free. Incoming Broadcast traffic goes straight to a monitor of the relevant department - Ops, Supply, ME, WE etc. Outgoing traffic needed only a little more control. Not much radio re-tuning if you have Satcom running, and short-range (UHF) circuits are on much more stable transmitters and receivers.
As for the Tactical side, more and more use of secure voice comms, and less need for 'translation' of signals for the CO. V/S is more or less obsolescent.
End result, the CY/RS could have combined yonks ago, and the same with the operators - all now Operator Mechanic (Comms).
I'd appreciate a more accurate update of the branch, but it seems even the RN Communicators Association website is now closed!