In most 'normal' Airlines, the career progress from Right to Left seat is just that. It is assumed that all the 'wrinkly bits' will be ironed out during the early years in the Company and you then wait your turn. The 'course' involves a few Sims to get used to the physical move itself (I have never heard of anyone having a problem) and about 6 or so Line Trips to get used (and be 'trained') to calling the shots, then probably a couple of checks and THAT'S IT!
Cathay treat people as though they have never seen them before so 40-70% actually fail the course. That is completely outrageous and (CX language for the 9th Floor - MUST BE COSTING A FORTUNE).
A previous CX manager who went to be DFO at GSS changed their 'command course' to about 12 sectors. Almost 100% pass rate too.
There isn't much Training but lots of Checking. People who are paid to Train and don't should be kicked out of the Dept. When did that last happen??
Anyway - been like this for decades and won't change.
