USB-C is already used for iPad Pro charging. MFi provides a firewall against Apple having to support external, 3rd-party USB-C devices directly on their handse

USB-C is already used for iPad Pro charging. MFi provides a firewall against Apple having to support external, 3rd-party USB-C devices directly on their handsets, as well as to address their power and data consumption and throttling. MFi / Lightning also reduces the physical attack vector-not defending it per se, but calling it out.