Why the constant need to compare what we have now to what we had in the past or, as you have done here, what was PLANNED in the past?
There are so many things different between the situation in 1950/60/70/80/90 to now, that such a basic comparison is worthless. You might as well say 'we had no submarines in service in 1960 so why do we need 6+ now?'
Why not just work out what we need now and in the future, and go from there? If that happens to be less than what we had in the past that's great, that's more money that can be spent in more useful places in our society. Like subsidising the cost of pet psychiatrists. Because they exist.
I was referring to the numbers desired / planned to illustrate how consistent they are across decades and different colors of government. Each time these numbers come up is following a strategic review of what is actually required to protect our interests within the geography of our region. The 23 destroyers and frigates was under Gorton, post Suhartos accession to power and under Hawke / Keating as the cold war drew to a close. In both cases it was as a result of a strategic review into our national requirements once the obvious external threat had been removed.
Basically there are x number of strategic points that require y number of hulls of z capability to control them. As the threat profile changes the so does the quality of the platform required and to a lesser degree the number and type of platforms, but not the number of points to be controlled As technology improves individual capability goes up and for instance some screening combatants can be replaced by helicopters for instance. At the end of the day if there is a requirement to control x number of points you will still need a minimum number of hulls to do it and we always seem to have fewer than any, non-budget driven review has indicated.
Even Rudds white paper that left major surface combatant numbers at 11-12 doubled the number of submarines to 12 which would in actual fact cost significantly more than building 8 instead of 3 AWDs. This brings us back to the same sort of numbers that have been discussed for decades. The logic behind the subs is that they would be more survivable than the skimmers in the more exposed geographical points.
While one of my dogs is a little neurotic and I suspect one of my parrots is a psychopath I would rather see the money invested in meeting identified (over and over again) capability requirements than to increasing access to pet shrinks.