"Even car mechanics and construction workers are held at much higher standards than this."
This is not universally true. Many of the best blue collar wokers I've worked with had no formal training or certification, some have. A few trained and certified blue collar workers I've known have been mediocore at best.
The alumni of certifications, official training, and schools are only as good as the integrity of the institution and of the alum.
More broadly people who refer computing to the standard of construction/architecture would likely be severely disappointed if they had a glimpse how the latter is really done.
This is not universally true. Many of the best blue collar wokers I've worked with had no formal training or certification, some have. A few trained and certified blue collar workers I've known have been mediocore at best.
The alumni of certifications, official training, and schools are only as good as the integrity of the institution and of the alum.