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

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.