You may well be right,
but I was told that during a week's sailing course ( I was already an experienced yachtie but managed to screw it out of BAe on leaving ) by a very experienced 'Jimmy' and it has been related in several books since.
Then again, there's a lot still to be learned by the unwashed masses like me ( I had a tiny involvement in the Falklands as in producing trial fit detail photographs of various gear in a hurry for designers ) - and Nigel West's book 'The Secret War For The Falklands' is a bit of an eye-opener, with tales of planned airstrikes on the Arg' Navy in port...
I can't help thinking even a couple of 'medium / light' modern torpedos would spoil anyone's day - and back to the main question, why not the Exocet carrying escorts - as I've heard repeatedly - or were they not so equipped ?