Two reasons for this come to mind, in addition to the "rain on the roots" idea: dry surfaces are less able to support fungal/bacterial growth, and suspended wat

Two reasons for this come to mind, in addition to the "rain on the roots" idea: dry surfaces are less able to support fungal/bacterial growth, and suspended water is less likely to damage the leaf cells with jagged ice crystals in the event of frost. Awesome article! :)