@adventure_tense The even stronger mode for disabling charging exists to eliminate the firmware and kernel attack surface from charging including USB-PD rather than to serve the purpose of actually stopping the device being charged.

It does still allow USB including charging when the device is powered off, booted into fastboot mode or one of the special OS boot modes (charging, fastbootd, recovery) so you can't brick a device by setting the USB-C mode to Off. Off is intended for temporary use.