Think less about the preservation of AM and more about the preservation of amateur radio in vehicles. The same EMI effects also make it difficult to operate HF in an electric vehicle. “So what? I’m not a ham and don’t care to be.” Well, consider that it’s the largest allocation of spectrum available for public use—the rest is commercial, government, and public safety. It’s an invisible National Park (international, really) that corporate entities either don’t care about or want to use for their own purposes.