I think from a regulatory perspective, the difference is intended use. Stock music speakers are designed to direct sound into the car. Users can roll down the

I think from a regulatory perspective, the difference is intended use. Stock music speakers are designed to direct sound into the car. Users can roll down the windows and turn the music up high enough to hear outside the car, but most people don't and trying to stop people from doing it is a fool's errand. Boombox is intended by the manufacturer to play sounds outside the car, so it's checked for interference with regulations. Kind of like how many wifi routers are capable of violating FCC guidelines on channels and transmit strength, but aren't classified as signal jammers because that's not what they're intended for. In my opinion, it's probably a thing worth fixing. I wouldn't expect it to cause mass loss of life, but it might save a person or two in unlikely scenarios, and it should be easy to fix with an OTA update.