The manufacturer should not call that cord an emergency release, because I cannot think of any emergency where I would need to oped the garage door super fast.
If the power fails or the motor dies on my garage opener, I'm going to take my time, open the garage door and put a car outside, then close the garage door.
If a real emergency then happens I can go out the front door and get in the car and drive away.
The cord is really a manual release, which suggests the device fails. Better for manufacturers to say emergency release as everyone knows you do whatever needed in an emergency.