I've been shooting film for more than fifty years and was raised on sunny 16 and know well how to use it, but IMO the human eyes are very poor instruments for evaluating fast changing lighting conditions because they react too quickly in a way that is imperceptible to the owner, and in this day and age when light meters are the norm and their cost can soon be offset by avoiding spoiled exposures but some photographers still insist on using sunny 16 out of some sort inverse snobbery to demonstrate how clever they are because they don't need a meter.