[noptd]

>If the car detects a problem in power supply circuit, it's perfectly rationale action to engage the electric parking brake as "last wish" when the car has stopped

Perfectly rational as the default action perhaps, but Tesla should still provide a way to manually override that behavior. We have the technology.

[Yaggo]

No. If the car is in power failure mode, it means that all systems may shutdown in any moment. So if you let the user to override the very important safety feature (of applying the electronic parking brake), there's a high risk that the car would die in free-rolling mode in dangerous situation. As a manufacturer you have to make this kind of trade-offs. I'm sure Tesla has put lot of thinking into this to minimize the risks in worst-case situation (power failure). It's easy to comment in internet without knowing/seeing all the details. Many commenters here seem not to have much knowledge of the basics of electric drivetrains or Teslas.