Cross-decking with USMC F-35B's given our relationship with them now is a plus for these ships and therefore the ability to carry our own jets is a positive for all of the ADF and our coalition partners.
HMAS Melbourne, as small as she was, was able to perform numerous fleet roles quite well. In the end old age [Cat issues etc] and "rust" caught up with her when defence spending was heading south. HMS Invincible was informally offered to Australia in late 1980 as a number of us were warned out to possibly go to the UK for training when a "deal" was done. Obviously other events overtook this...