An IG vinyl clad pool pool almost always uses vermiculite/cement mixture or sometimes sand.......I am sure there are some slab pools but I don't remember any as a common construction method.
Most slabs have a slight to them to help drain the water. You might not even notice it by look at it but if you put a marble or ping pong ball on it you will see it or a large level.
The other reason is the concrete could rub the bottom and wall where it meets the bottom and cause holes.
Also kind/people jumping from the ladder (we know they will ) could get hurt from landing on the hard surface.
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