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

At one point I had my mattress and box spring on the floor very pregnant and unable to climb into our bed easily. I figured out when we put it back into the bed frame how much more comfortable it was. On the floor it had no give if that makes sense.