I suspect the answer is many won't be able to differentiate, even some professionals, especially when they are more traditional oriented. But randomness is employed not just randomly. When it's spread across registers, avoiding too much clutter it can make for interesting listening to some. The Bubbles piece was not appropriately spread across, as I hear it, since a kid hammering on a piano would repeat much of the same notes/range, in a way which is unmusical. For the board who approved the piece, I'd say they were incompetent.