The difference to an ICE car…
The difference to an ICE car is, that a 12v fault could easily be rectified, the car jump started or similar but would still be drive able.
An EV that is being charged overnight, should not have these issues that can only be rectified with dealer intervention, tow truck or similar.
As the EV is being plugged in, it should be an easy fix to trickle charge the 12v battery to run the car operating systems.
I guess the main issue is that the car becomes bricked without this being managed properly.