Did the carriers Melbourne and Sydney carry any missile systems? Apples and oranges, to put it mildly the LHDs are amphibious ships which will always be escorted in the same manner as the light carriers in the past. And if events do get drastic, there is plenty of room and hopefully time to mount RAMs or another short range missile system during the next forty to fifty years.My experiance, very dated, suggests that MFU do carry a weapons load beyond basic ops. Now this is dated but the River Class carried a load out of 4.5, 5 cal, Ikara. AST and sea cat that catered for a response across the specturm of operations.
This being said we could have been a lot better armed.
PS the O boats always carried a load out of 48's as well.