Flight detent. I would agree that the crew have an essential task every time they put a plane back down on the ground, it has to be done properly every time, time and time again. I would ask you however to consider the external surface area of say, a Boeing 777-300. with my operator, the Licensed Engineer is expected to make a quote " general visual inspection " and this is from the ground, during the day or night. I cannot reasonably be expected to view the upper half of the fuselage from about the floor line upwards, the top of the wings and horizontal stabiliser, let alone the fin and the fuselage crown area ! Often, cracks will appear out of eye sight ( Hawiian B732 ? ) both internally and externally. To examine every square inch of my company types would take me a lifetime and is wholly impractical. At night, obviously with only a torch, the task is further complicated. A walkaround check can only ever be a sample inspection unless the aircraft is perhaps GA and the preflight time available is unlimited. Most experienced ground engineers who are fairly conversant with their own types know instinctively where to look for problems and this in practice works well. I have never viewed with suspicion another pair of eyes walking behind me, in fact I would welcome it but to compare a pilot's work in the approach and mine during a walkround is like comparing apples to oranges . . I think you will find that most Licensed Engineers take their task very seriously indeed !