I’ve seen Tesla’s shut the car down and force an update in the middle of the road because they were parked in a ramp and didn’t have OTA signal/wifi.
What’s crazy is that it’s mostly unnecessary- you can update almost everything behind the scenes, and then push the ones you can’t once the drive is stopped.
Worst part is they sat there in the middle of rush hour traffic for ~20 minutes while the slow ass download happened.