I understand what you are saying about a sub fleet being a core element, strategic weight etc, but to be realistic the visual presence of a carrier in a given situation is also a very valuable show of presence and power as opposed to subs, which you know are there but not in your face. The US and to a certain extent the UK etc have proven this time after time.The sub fleet is a core element in ADF doctrine and govt sees a bad ass SSK/G fleet as increasing our strategic weight regionally and acting as a form of deterrent, a single carrier probably wouldn’t do the same. Plus you have to remember that investing in home grown mean investing in Aus R&D base which pays off long term. Still bargain basement prices.
Sorry but would have to totally disagree with you on long term payoff in Aus R&D in a home grown sub ? Would be interested in what payoff we have had from the Collins so far compared to the investment we have made.
Now don't get me wrong I am not dogging the Collin's as a sub, it is the most potent conventional sub in the world, just ask the US (not that they will give you a real answer) but I can't see any pay off, let alone our ability to actually man 12 subs larger than Collins