This is a good opportunity to remind people, that they should have a window breaker tool in their car. (xmas gift?)
https://www.amazon.com/s/ref=nb_sb_...ps&field-keywords=window+breaker+tool+for+car
Not specific to Ford, there were situations in past years where people would get trapped in their car after hitting a body of water (like a lake) because the door locks shorted out. Memory serving, they incorporated a mechanical unlock function in later model years that allowed people to exit the vehicle even after the electronics "lost" power.
Power locks or not, it's normal for cars to allow a door to be opened at speed. The doors will at least, auto-lock above 10mph.
Ever notice, the single-press to stop the engine doesn't work above creepy-crawl speed? (you have to hold the button for a considerable time) I'd imagine that the door locks could function the same way.... but... how does this then jive with the supposed mechanical override? Is the mechanical override only for the front doors? That wouldn't make sense either. Panicked passengers aren't necessarily in a position to crawl up front (over the dying driver) to get out. It is possible to engineer a mechanical override that would disallow opening when the ECU is registering above a given speed. But given that wet circuits are known for unexpected behaviors, how could you make that fool proof and at a reasonable cost?