I was thinking of the oiling system as just a cooling system for the motor. Totally overlooked the lubrication aspect. So, yes, a more timely warning than just the temperature sensor would be a good idea.
Still, i think tying the temperature sensor into the controller to automatically reduce the power to the motor is a good idea. This would also reduce damage due to the oiling system working but the load on the motor being above the capacity of the oil to remove the heat.
There would be no reliance on the driver to analyse multiple data sources in real time.
This would be especially important if it was not just the EV builder that was going to be driving.
Some drivers will still ignore the check engine light, oil pressure,engine temperature etc. so having the system able to protect itself might be a good thing. Not that i would ever let someone like that drive my car.