Some of you are just not thinking straight. You are interpreting the problem backwards.
My SIL is one of the smartest people I know- a software developer. But that's not what makes him smart. What makes him smart is that he has an in depth understanding that software developers make truly terrible software users.
You are thinking like software developers.
You are envisioning a nicely designed electronic exit latch. You are picturing it well executed, and documented. You are even considering the possible problems and designing for them. You e considered a backup system, and even imagined language barriers, so you've included little icons that don't require language, and put the backup latch where people can see it if they look a little farther, or bend a bit.
But you are running the problem backwards.
Now, imagine yourself in the actual situation. Imagine being old, a little slow, not very agile. Perhaps not quite as quick thinking as you used to be.
Imagine reaching for THE door latch (why would a door have 2?), and it doesn't work. E36 M3. Door latch is busted. Well, that's ok, I'll try the window. Oh dear, that's broken too. Now what? Maybe I can catch the attention of somebody to open the outside latch. Oh dear, it's so hot. I hope Fifi is OK. How did I get in this mess? Why can't that guy hear me yelling? Now what am I gonna do? Oh Fifi, you poor thing! Maybe I can reach the passenger door- oh no! That's broken too! Where's my medication? Oh my God- the rear hatch won't open either! Fifi, what are we gonna do? HELP! HEY MISTER! CANT YOU HEAR ME? Maybe the open..opener's manifest.. Mani..mani, I mean Owner's Manual...
There is actually never a logical moment that anyone would stop and say (in their best Dudley Doright voice), "I'm sure the problem is the automated system has failed- there must be a manual override that I must utilize"! Ta Dah!! Yipee! Horay for intuitiveness!
No one should be able to be locked in a vehicle if the door latch fails.