WiFi and Bluetooth basebands are regularly compromised by attackers, through no fault of Apple. There are use cases for offline pocket computers, which never use WiFi/BT, have wired headphones and intermittently sync data via wired ethernet. Would love a kill switch for all radios & microphones & cameras, plus the return of touch ID.

Google Project Ara used UniPro (https://en.wikipedia.org/wiki/UniPro ) as an interconnect for modular components.