I believe they are healthier overall at a higher humidity.
He probably doesn't have to worry about humidity because his humidity in the enclosures is within parameters without him doing anything.
My natural humidity here in Florida is often higher than even recommended. Someone in a dry MidWest state may have major issues without taking particular care with their enclosures.
People who use tubs and racks often have no issues. People using tanks with screen and lamps have to be more careful.
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