there's several "drive-by" inspectors out there, i guess to go with the level of RE agents flooding the market. my 1st home used such inspector (i was ignorant), my 2nd home i had more experience so i went to about it differently to find a better one.
the guy i used walked us through the entire home and described what he's looking for, what he expects, what he's doing to test it. showed us the instruments he used to look for etc. found several things for us to keep in mind in terms of repairs or to negotiate so we should choose (doubt you get to do that anymore these days).
while it's true they cannot be intrusive they can use meters to detect mold and moisture, and also conduct tests to try to flush out leaks. water damage is the scariest thing for me
that being said after going around with him once, it makes sense what to look for, minus owning the instruments for moisture.