Yes Spongebob - our politicians should be charged with criminal neglect by proceeding with these obsolete submarines and, when they are easily sunk with the consequent loss of life, manslaughter.
As you say, the Collins class has crewing problems because being a submariner is not attractive to modern day sailors. And its a no-brainer why the rest of the world is concentrating on unmanned military equipment. Robots, drones, unmanned undersea vehicles etc. Its because trying to get crews to man this equipment will be nigh on impossible. The modern tech-savvy sailor knows to keep well away from outmoded equipment that gives him nil chance of survival in a conflict.