In the model 3 at least, the rear doors can also be opened without power by pulling a cable. Not as obvious as the front doors, I’ll say, but you will be able to get out.
https://www.tesla.com/ownersmanual/model3/en_us/GUID-A7A60DC7-E476-4A86-9C9C-10F4A276AB8B.html
That was added in this year’s model. All previous Model 3’s do not have manual release for the rear door. https://youtu.be/Cfk8Erx8Wiw?si=MGK94UX_qavyOuVr
Besides, having manual door open under a hidden panel in the bottom of a door pocket is ridiculous.
Mine is from 2019 and I have to actually tell people in the backseat to use the button and not the handle, because it’s so much more prominent.