Ok, I could possibly see that to a point but if the mass backing is a harder rubber type of material, wouldn't the rubber stretch and still cause a bump if its a harder type of rubber? Granted, softer, more flexible rubber would most likely return to its original shape but I'd still be concerned about folding that mass backing to those sharp bends like how they are folded and stuffed into the boxes.

Either way, I don't think ECS offers the carpet with that mass backing material on it as that is something that would not have been like that from the factory.