In some cases that may be true (there are just as many bad electricians as there are bad inspectors), but the reason you need to know the code is so that you can install this stuff safely and not get your butt sued and put you in the poor house, or worse kill some innocent bystanders. If every EC put in code compliant installations, there would be no need for inspections other than for homeowners. I can see why some have beefs about inspectors, and your point is well taken, but imo just slightly off the mark.