They’re about having a comfortable entry level rather than having to stoop down; they’re about having additional shock absorption to reduce wear and tear on mattress; they’re about airflow through mattress for comfort when sleeping, keeping it from smelling/letting sweat dry more quickly, letting dust settle through
You need to ventilate under a mattress, at least in a climate/room that is not dry.
In Japan people sleep on cotton mats on the floor, but they move the mat in the morning to get it out of the way and to air it.
There is also a comfort consideration with having high beds that are easy to get out of, especially in our sedentary western lifestyle where most people are quite stiff.
My Father was a trained upholsterer, and his apprentice jobs were rebuilding spring mattresses. He replaced bent springs, rehorse haired and re-ticked the top. He said that the beds with open spring sheets unser the main matress gave an aired, comfortable bed on which to sleep. Beds were rebuilt every ten years.
There’s many individual answers but mot a comprehensive one, so let’s combine them
1) Because it’s more comfortable to get in and out of (chair height rather than getting up from the floor)
2) The floor can be cold and transmit it into the mattress, plus you have cold drafts near the floor.
3) It would trap moisture and rot the mattress
4) You actually recover some useful volume for storage, otherwise it’s wasted spave all the way to the ceiling
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