Earlier quoted context omitted.
Next time you cross a bridge, realize civil engineering has the same issue.
No, it doesn't. Before you can design a bridge, you have to graduate with a four year degree in Civil Engineering. Then you have to pass the Engineer In Training (EIT) exam, then work for four years in the industry (helping with, but never actually able to sign off on, designs), then pass the Professional Engineer (PE) exam specific to the discipline you now have 4 years experience with. Then you get to design your f…
You do not need a degree to be an EIT. You do not need to have studied engineering to be a PE. The CAD tech who assists in design (to the review board:"so I've been told by our competing firms") does not even need a high school diploma.
The PE who seals the plan is human. He had four projects going, they all have deadlines, and he trusts his staff to get it right. He checks as much as he can, but he doesn't have the time or the skill to check everything. He often cannot even check his own assumptions on many calculations because half his focus and career development is on project management and business development. It has not been on double checking the basis of the formulas his software has implemented.