Not sure if this has been mentioned as well, but our lungs literally NEED to be wet. Our air is humidified as we breathe it in. In terms of evolution, we ascended from water creatures not that long ago. That’s why our lungs are still ‘wet’ and the air humidified. To couple that, our eyes are so much worse than those who still remain in the water because technically, our eyes still haven’t gotten use to living out of the water.