The system never warned the grandmother that the auxiliary battery was dying (if she even understood the consequences of that).
There's no transfer of the charge from the main batteries to the 12v auxiliary battery in case of an emergency.
There's no way to manually unlock the doors from the outside in case of an emergency.
That toddler would have been in real trouble in an isolate area where there was no one to respond fast enough to break the glass in 100 degree weather - all because these ignorant engineers (and the ignorant quality control team members) have no understanding of the history of safety devices in cars and that the drive to make everything a gadget puts people at risk.
While normally ascribed to aviation safety, a Tombstone Mentality is "a pervasive attitude of ignoring design defects until people have died because of them" and any engineer who paid attention in a real education program would have learned about it. More and more engineers are restarting their understanding of automobile safety in the early 1900s and learning as they go, at the expense of their victims.
Safety is paid for with the blood of those who came before.
If I was out in the wilderness and couldn’t open the door, I would pick up a big rock and smashed the driver’s side window.
Batteries can and do die suddenly without warning. They come with warranties for just that reason.
Don't all Tesla owners carry batteries with them just in case this happens?
The unwritten engineering rule that applies is "just because you CAN do something, that doesn't mean you SHOULD do something."
The biggest argument for that is the trend toward moving most operator controls and indicators to a giant touch screen.
Most cars with electric locking systems have a physical key that will open a door from the outside, though sometimes a little cap has to be pried off to get access to the lock.
The geniuses at Tesla decided that wasn't necessary.