In North America, experience is gained flying bush or checks, then twins piston to turbine followed by small jets in commuter airlines with lots of crummy weather in the Northeast.
And guess what: a number of these up and coming pilots end up in fatal accidents along with a small number of passengers behind them.
By the time a North American pilot makes it to a widebody command, he or she has survived the winnowing that has taken out some of his or her aspiring colleagues.
The Asian airlines do not have this pool of pilots who have ( paid their dues / survived lower tier carriers ); so have to use a cadet system if they want to hire their own nationals.
A cadet system can work very well. It does in the military where pilots end up with serious commands in a few hundred hours.
But if all you train is button pushing, that's all you're going to get.