We've never seen any studies that show that whatsoever. If I look at Manitoba, as I mentioned before, they have a 2:1 ratio, so two apprentices to one electrician. British Columbia has no ratios whatsoever. Alberta has other schemes where senior apprentices don't factor into the equation.
The reality is that work today is inspected by electrical safety authorities. It's inspected by building inspectors, by engineers. Companies wouldn't be in business if they didn't produce good quality work and good quality people.