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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