Unfortunately, it's no different here in Aus. Their fine print always reads that they are not liable for anything they get wrong or miss, one example: termites.
To be fair it's written that way because it's not possible for the inspector to visually inspect every structural component of the house because more often than not they can't get access, whether that's inside wall cavities, underneath floor coverings, behind tiles, inside roof cavities etc etc. The guys here at my work do pre-purchase inspections and the inspections are done in accordance to AS4349.1 - which no doubt most accredited inspectors would do as well.
It's no different to having a mechanic look over your second hand car, then expecting him to give a written guarantee nothing will go wrong with the car in the next 6 months. No doubt he'll give you his opinion on the condition, point out some obvious and not so obvious issues as well, provide some advice of what is causing the issue and how best to fix it, but he won't give you any guarantees...
So long as you understand the advice they give you is general based on what they can see and is not any type of guarantee, then I'm sure you you'd sleep better at night knowing you've had an expert check your house out. The guys here at work have years of experience doing these types of inspections, and more often than not know what the common issues are for certain building types and issues with houses in certain areas. You just need to find someone in your area that is experienced in doing this type of work.
The flip side of all this is that you can get more detailed inspections done, which involve more time etc and would provide more assurance, but like most things people don't want to pay for this level of investigation.