I'm not sure whether it is CBT or the current training curriculum, but graduating trade apprentices trained under a CBT system, do not appear to be anything near the quality of graduating apprentices from thirty years ago
I'm a product of the 'old' trade system. It didn't matter whether you'd seen every type of repair or indeed made every repair in my trade. You were an apprentice for 4 years. I can't recall any of us expressing any desire to get signed off early. I loved trade school, it was a great break from work and the trade teachers were the best of the best.
There are huge gaps in tradies knowledge these days. You may as well do the work yourself. In a lot of cases an 'apprentice' has demonstrated competency on a particular job sequence once. CBT is a scam perpetrated by scab employers & politicians who don't want to resource and fund trade schools.