Don't forget their secure boot measures on the onboard microcontroller, to stop malware or a rogue Bluetooth device doing an OTA DFU update to swap around the G

Don't forget their secure boot measures on the onboard microcontroller, to stop malware or a rogue Bluetooth device doing an OTA DFU update to swap around the GPIO pins to indicate "activated" and not actually arm the system... Some kinds of devices just shouldn't be connected - they should be sold and bought as-is, and function independently of outside factors, as they are safety devices.