Hence why the companions and trade schools existed, and why internship exists in white-collar jobs (because if the new hire destroy the prod DB, it cost way much than a kid dying on the job).

Also, one major flaw that the US caught by destroying its trade schools and hiring like qualifications do not matter is that the skill level of your construction workers seems abysmal from my point of view. Only talking about carpentry here, since it's the only trade i witnessed, but if you've worked in carpentry for ten years and don't know how to apply basic math theorems on triangles and draw a plan, you might want to go to a carpentry school.

Also: imprecise cuts, cannot use protractors (thus redoing the cuts multiple time) and poor understanding on how weight is distributed.