What are you doing that your parking brake is saving you in a parking lot (5)?
It applies the brakes automatically when you are within about 6 inches of an obstacle and moving towards it. Often false-fires when parallel parking in tight quarters or reversing with a bike rack attached.
This is a different, ultrasound-based system that had been on cars for about a decade now. It has limited range.
Not to be confused with the newer autonomous emergency braking systems that are radar-based(believe mm-wave radar) that has range more appropriate for road and highway speeds but has the limitation of not being able to differentiate stationary objects from terrain.
the "emergency brake" is also shown on Ioniq 5 screen every time it gets triggered.
So can "emergency brake" mean a different thing?
There's the "Emergency brake" (aka e-brake) which is a misnomer for what is actually the parking brake (not to be confused with the Park setting in an automatic transmission) or also called the hand brake for cars where this brake is a hand lever rather than an extra foot pedal.
And then there's "automatic emergency braking", which is a computer-controlled automatic brake that gets applied when it detects an obstacle.
I thought an emergency brake was a technique, rather than a device? At least, thats how I understand it in the UK.
Next biggest issue is probably if the car gets hit hard enough to break the parking pawl. Parking brake could save it from rolling away.
The pawl itself is not a tiny pin and will take some abuse, but maybe if you talk to mechanics in SF where people park on hills they see them fail all the time? That isn't the primary reason why I'd suggest always using the parking brake, even on flat ground though.
Unfortunately, it looks like it's no longer possible with an electronic e-brake: https://www.youtube.com/watch?v=9RCFfThqbe8