So there's something that has been bothering me for a while.
Australia plans to expand its fleet of submarines to 12 units. Australia also plans to operate 12 major surface combatants: three Hobart-class destroyers, and nine future frigates replacing the current eight ANZAC-class frigates.
Does anyone see anything wrong with this picture? Is there any other navy in the world that operates as many submarines as it does surface combatants?
Of course different countries have different requirements. But a submarine is fundamentally an offensive tool to threaten enemy warships and merchant shipping. The basic strategic tasks for the RAN are to maintain the territorial integrity of Australia -- and submarines can certainly help with that by threatening enemy amphibs, aircraft carriers, and the like -- and to maintain the flow of trade, i.e. to protect merchant shipping. The latter calls for ASW and AAW surface escorts, not submarines.
At first glance Australia's force structure appears unbalanced, which invites one to consider exactly how the figure of twelve submarines was arrived at in the first place. Apparently it has subsequently been validated by committee, but so far as I know such an expansion -- a quite radical doubling of the existing submarine fleet -- was first aired as a thought-bubble by then-Prime Minister Kevin Rudd, and which subsequently found its way into the 2013 defence white paper where it became the new orthodoxy.
So the question is if a future combat inventory consisting of 50% submarines is really the correct path for Australia.
I think the only logical conclusion one can come to -- and which I think has been obvious for a while now -- is that Australia's basic strategic tasks are different to what you laid out.