The original idea for VESS was to at least simulate the sound of rolling tires and purring engine. But legacy beeping backup sound was too annoying. (and not legal for mfg to provide an off switch) The Kia VESS module/speaker is on the front facing forward. It is extremely loud in reverse apparently to make sure that if someone is behind you and hundreds of feet away with their back turned they will hear you shift into reverse. It is also a penetrating sound through home walls and windows. (no sneaking out in the middle of the night undetected😂) I can imagine many focus groups and lawyers had a say into the penetrating sound and volume.
Some have complained that the small, low backup lamp on the Sportage is not a very visible indicator to warn people in a parking lot that you are about to back out, so maybe they made the sound especially loud to compensate. But if people don't know the sound, they would probably look around wondering what is that crazy sound and where is it coming from? It is also probably also very loud because the front speaker is pointed in the wrong direction for reverse. I would prefer having an additional rear speaker that emits an appropriate volume (same as front volume in forward gear). Cost killed this idea.