/quote]I don't even know why it should be called the 'Aussie method'. It should be 'THE METHOD', why ever do it any other way?[
There are plenty of reasons, some good, some bad (reasons). Often, there is much more going on that may require a pilot remaining un-clipped.
In our towing operation, loading onto the tow rig can be a very dynamic situation, being clipped in is hazardous. Attempting to load a glider into the system with a harness already clipped in compromises the loading process and adds complications to a already challenging situation.
If your in a launch lineup, again, in a very dynamic launch situation (dust devils and such) being clipped in well back in the line could again compromise your safety (and the safety of others around you) as often the pilot may need to leave the control bar to secure the wing. (Tho… in your typical launch lineup having the harness clipped in is probably your best option).
What the problem is, is complacency. A pilot that does not take charge and manage the responsibility of his/her aircraft is likely to make these sorts of mistakes. Weak or poor procedures leave a pilot wide open to mistakes. A lack of focus on the task make all of us vulnerable to distraction. Distraction kills.
As to "watching out for your fellow pilot". Its nice, admirable and ethically the right thing to do but ultimately it's the pilot that has to take responsibility for all aspects of operating their aircraft. When I head out for a day of flying I would never rely on someone else for my safety.
Martin