the true gauge of their ability is assessed during training and proven during checking
Although this sounds logical, it's more complex today than earlier, due to the erosion of training standards.
At a major carrier the last 5 incidents all involved new trainers. The problem seems to be that t+c's for trainers at almost all airlines are unattractive. Effect is, that the 'wrong' pilots apply. The ones who want to boost egos or the young to enhance or protect their careers. The first are never, the second not yet suited to provide adequate training and checking (the companies love them though, very obedient).
Training needs a huge global quality boost before above statement can validate.
Some very smart actuaries who have no emotional dog in the fight have determined that these numbers create superior pilots
I don't really consent with that statement. Numbers alone can't do the job. However in the absence of the above, numbers are more efficient, because experience works even on less skilled pilots. At least better than the stereotype, short, cheap and mostly virtual sop-drill that todays airlines call 'training'.
It's a complex matter. Numbers needed to be increased, but the worldwide training disaster should to be addressed just as agressively.