Not sure what kind of inspector you got?
* No general inspector I have gotten was qualified or willing to touch the roof. If I wanted to look at the roof condition, I needed to pay a roofing company separately to come out.
* The electrical inspection consisted of taking the lid off the electric box, and looking for loose wires, and putting a "does this have ground" meter in all of the power outlets. Most of the interesting electrical issues that could exist are burred in walls and not accessible.
* General inspectors are not HVAC techs, and can't really say much about HVAC beyond "The furnace is 14 years old based on the install sticker, and appears to turn on"
* Structural issues were like.. look for visible cracks in foundation, but much is likely behind drywall and unable to be seen. Maybe put a marble on the floor and see if it rolls.