Yes, that's important too. Such a system shouldn't work at all when there's no power. I imagine that can be accomplished with a mechanism that has to have pow

Yes, that's important too. Such a system shouldn't work at all when there's no power. I imagine that can be accomplished with a mechanism that has to have power to stay in a position that interferes with opening the door. What happens when power fails is pretty important. What happens to an automated vehicle when that happens, for example? If there's no driver, they'll a mechanical brake that isn't used whenever power IS available. When power fails, it would engage. More to your point, I've heard the Tesla Model 3 rear doors can't be opened from inside when power is lost in an accident. That could be a serious problem in an accident. Maybe they've fixed that or will soon. They will definitely fix it before I would purchase one.