Whether the examiner on orals is good or not atleast the fact someone is attending an oral examination is intimidating enough that it would compel them to study properly and fully know thier stuff before sitting for the exam unlike now when most people simply sniff around question banks, by heart the questions, literally the same questions come in the exam and they pass it with distinction when they know bugger all.
Then do 2 years of fitter work with minimal knowledge, get licensed and subject the aircraft to havocs.
I can't even stand it when I work with someone thats licensed and knows next to nothing and they've been prolific in my place of work but thanks god in where I work you can't be approved unless you attend an oral board examination with the quality manager and the training manager who really know thier stuff and would easily find out if someone is inadequate.