Oh no, a system makes an improvement, but not a perfect, 100 percent improvement, so what, lets throw out the improvement it *does* make?
It's not an improvement across the board. It's likely not an improvement at all, if you are listening to elevator music to make you calm enough to drive in the first place, and suddenly there's a startling "BRAAAAAAAAAAAAATTTTTTT!" that could just as easily come out of the ambulances horn, but didn't, it came out of your radio.
Also: call me back when it can turn an off radio to on, or force your stereo away from whatever you're listening to, over to the FM band so the ambulance can scream at you more than the flashing lights, siren, and horn are already screaming at you.
Also also: so I assume the computer in self driving cars will now listen to NPR most of the time so that the FM radio will alert the car's driver -- a computer that apparently likes "Lake Woebegone Tales" -- will "hear" the ambulance.