Engineers on this thread do have one goal in mind- engineering presence for every departure, not primarily for safety reasons, but industrial.
Well I for one hate transit checks. Nothing so boring as wandering around an aircraft and finding nothing wrong. Luckily my airline lets the crew do the transits, then they call me out if they need help. So I sell my services to other airlines to make some money for the airline, but am on call if required. They know I am around, and I get called out to around one transit in ten.