goodonyamate - probably nothing more dangerous than an FO who likes to think he is 'carrying' the captain.
I wasn't QANTAS but major aviation was not always as you suggest.
Qualify as a cadet, say, twenty one years old?, go do 1500 PIC with a carrier that will give you that kind of experience, back to mainline for ten years as a SO, upgrade to FO, at least ten years in RHS before even considered for command, when promoted many years on a stand-by roster, retire at 55.
Always an eye opener when a young buck climbs into the LHS for the first time in the SIM. Interesting to observe when things start going wrong. Nothing out of the ordinary but just the normal SIM stuff, except this time all eyes are upon him and all decisions are his. The hardest part of a right to left seat transition is the mental transition and that is where the cracks will appear, if any.