All of those things are opinions and guesses. Apples to oranges my man.
Even within your context, I sit behind a computer all day long, looking at tax returns, credit reports, financial statements, etc. If there isn't obvious damage I highly doubt I'd pick up any problems with a house. Foundation? Looks like concrete to me! Structure? Somewhere under the sheetrock, right? Electrical? Been shocked before, fool me once. . .
If it's not obvious to the naked eye, I ain't catching it. And frankly, that's probably true to nearly all homebuyers unless they work in the building/construction/inspection industry themselves.
I've spent my life having to trust "proffesionals" (

) for any variety of items; it's fact of life for the vast majority of us whether we're talking about inspectors and mechanics or doctors and pharmacists.