Dick, just maybe it's because those airline crews are concerned about the possibility of unknown VFR traffic in the class E airspace.
I don't believe there's an airline in Australia that would use an IFR pickup or VFR climb procedure to enable climb into class E. The airline I work for expressly prohibits us from using these procedures.
Can you please go back to the previous NAS thread and supply some answers. Your silence is deafening.