many Aussies o/s don't come back because they refuse to be treated like dickheads & disrespected by the HR Departments
You think that trait is exclusive to Australian Aviation? It isn't - it's worldwide.
I'd hazard a guess that the overwhelming majority of Australian pilots that choose not to return don't come back because they would have to start at the bottom of the seniority list, forced change in rank, and thus, take a substantial pay cut to do so.