In some cases, it is best not to know.
The other day I was flying to SYD from MEL and an earlier flight was cancelled due to a mechanical issue with a 767. From the lounge window I could see maintenance men servicing the 767. It's surprising how untechnical it looks when you see a lone man climb a ladder and open the side of the engine with a spanner and go to work. It would have made me nervous if the plane I had to travel on was the same one I had seen a sole technician tinkering with just minutes before.