The higher amount of moisture and hotter air feel more uncomfortable and even oppressive to the human body, which is why we only show dew points on the "Muggy Meter" and not relative humidity.
Dew point measures the air’s moisture content directly and impacts weather perception more accurately than relative humidity.
At 20% relative humidity, which you would see in desert ... It only costs $2 for the raw materials to make one square meter. How often do you worry about the quality of your drinking water?