I never quite understood how a walk-around inspection can reasonably be said to have fulfilled it's purpose, when it's always performed whilst ground handling is taking place. Surely the only correct time to complete this activity, would be after all ground handling has ceased, all equipment bar the jetty/stairs and push-back has been removed and nobody's driving any piece of equipment around inside the circle-of-safety.
But that'll add 5 minutes to the turn-around times, and we all know safety is only the number 1 priority until the bean-counters dictate otherwise.
That last sentence says it all!