I was referring to the apparent capabilities of the inspector, whose report spawned the original post. Missing the obvious safety/code issues is an indication of the ability and he may just be an out of work contractor with no credentials.
The views on other problems can only be discovered with the removal of certain items, visual observations give enough clues to much bigger problems. The buyer and inspector are only guests in the house and open the doors with red flags doors for specialists, like structural engineers such as BridgeMan suggested that can give more accurate information on what is required to the buyer on the credits expected for deficiencies in the home. As a registered engineer, I always found it to be hindrance when the owner has the right to limit accessibility for you to look at many things until after he sold the home.
A smart seller will hire the most expensive ($400+) home inspector around (for a pre-sale/prelisting inspection) to point out the problems for correction since he has more experience and knows what the buyers inspector ($250-$350 for an inspection) might find.