Buddy re-fuelling is really only needed when flying from carriers a long way from shore.
Otherwise, it is far more practical to use old bombers or converted commercial airliners, because large transports can carry thousands more gallons/litres of fuel than any front-line airplane. Airliners can also orbit for half a day.
The third advantage of airliners is that they can cruise at the same altitudes and airspeeds as most fighter/strike airplanes.
Fine, in theory. However, in early 1960s. large airliners were new and expensive to purchase. The RAAF would have been faced with a considerable bill if they purchased 707/KC-135s or a similar sized refueller. The Canberra was never adapted for air-to-air refuelling, except on a trials basis (one or two aircraft - none of which was actually fitted with a means to transfer fuel from the tanker to the recipient aircraft, except with a dummy probe). Now, if TAA had adopted the French Caravale, as was planned in the late 1950s, by the late 1960s, they would have been due for replacement. They would have made an ideal tanker aircraft. However, the "Two Airlines Policy" put paid to that plan...