eli5 Why Mattresses need frames and box springs for (stability) when the floor is a fully flat surface?

Question

I haven’t found anything scientific about this, but box springs are wooden slats sideways for even distribution of weight, but wouldn’t the floor be better? Does it damage the bed or affect sleep?

Or are box springs a solution to the manufactured problem of raising beds on bed frames?

In: 1254

Answer 1

Two reasons that I know of. One functional, mattresses need to be ventilated on the underside to prevent moisture/mold. The other is maybe just a preference but it’s easier on the knees and back to sit/lay down on a raised bed