You are confused. Sure, the issue is what the appraiser did or didn't do. But one of the things the appraiser has to do is sign a statement that the final value conclusion is justified.
The appraiser HAS TO DECIDE if the data he has been handed is correct or not. That is what the APPRAISER HAS TO DO.
So, if you KNOW the inspector is competent and you TRUST the inspector to provide accurate data and observations, that is fine - but YOU take responsibility for that decision. If it turns out that the data was not correct, that's on you.
Avoid getting too caught up in regulations. You are the appraiser; there is an inherent ethical responsibility to provide a value opinion that is as accurate as possible. To this end, I believe that appraisers should provide a low and high value, or range, for their value in addition to a point value, to communicate their certainty/uncertainty in the value conclusion.