On the inspection front there are plenty of other environments where mirrors are used for both looking underneath things and acting as a prompt.
See post #295 - even a visual inspection won't necessarily detect the situation where the latches have been pushed flush but the hooks haven't been engaged with the eyebolts. In those circumstances gravity will hold the doors almost completely closed (they weigh about 100lbs each) and the only way to know that they aren't secured is to spot a very slight increase in the gap between them, or to physically try to pull the doors open.