I definitely feel like there is some industry-type disconnect here where being in the manufacturing/production industry is different than the construction industry. It may be that in CWB1's industry if something is designed, it is manufactured and sent directly to market (although I'm not sure where UL testing etc fits in). But in the construction industry, there are levels of "review" that aren't "peer review". The jurisdiction plan check will review to some extent as will the contractor and subcontractors and project or special inspectors. Obviously they won't catch very complicated things, but they will ask about something that seems grossly inadequate based on their experience - which seems to be about the same level of review as the five minute review CWB1 mentions.
In this way, I think it's similar to what CWB1 brings up in regard to his wife double checking doctor's and others' work daily in the medical field. I'm assuming his wife is not a doctor (since he didn't say she was), so she is not a "peer reviewer" and she wouldn't be as qualified to review as a doctor, but she is another layer of review, much like the plan checkers, contractors, and inspectors. Continuing with the doctor analogy, much like with our industry, there are things that are always "peer-reviewed" by another full doctor or engineer like heart surgery or skyscrapers, but there is no "peer-review" when you go to the doctors to have them tell you you have strep throat.
Also, I'm not sure why everyone jumped all over stevenal. He never implied that public safety wasn't the number one priority or that engineers couldn't behave objectively. All he was saying is that if you want to be skeptical of an engineer's objectivity because they are the project owner, you can extend that same argument to the traditional arrangement where you can call into question their objectivity because they are being paid by the owner/contractor/etc.