Probably those who had massive errors happen because people bullshitted their way into a position. Certification is important. It’s impossible to test all the bits of knowledge required for a position every time someone applies for a position with the potential for huge fuckups (doctor, engineer, pilot, etc.)
I don’t want to be in the plane with the self taught pilot, even though I think the requirements in the US are kinda bullshit.
I’m not denying that schools are fleecing students and jobs have some protectionism going on with certifications, but there’s a balance to be struck. These requirements happened for a reason.