There are layers to this.
No exterior door handles is a massive danger in the event of a crash that incapacitates those inside. No interoir door handles is a massive danger to those inside in the event of a crash that takes out the electrical system.
That said. Plenty of crashes will "disable" the doors just from the type of impact and so forth. And those tend to be the really bad ones.
Which is why EVERYONE should have, preferably a pair, of those car window breakers. Keep one handy to the driver and one either in the box between the driver and passenger or somewhere very visible in the back seat area.
In the event of a really bad crash? That is how you cut your seatbelt if it is jammed or you are otherwise unable to easily access it. And that is how you smash the glass to get out. And if you pull up to the side of an accident? That is how you get the injured driver out (keeping in mind all safety related concerns with moving someone who might have a spinal injury).
Just... also be aware that it has become increasingly popular (and not just among swasticars) to laminate many of the occupant windows. This DOES prevent shards of glass from flying into your face in the event a pickup truck tried to run you over. This ALSO makes escape a LOT harder. It is good to actually read your manual (or at least the labels on the windows) to know which ones you can escape from in the event of a crash.
But yeah., There is no fucking reason to remove mechanical door handles. But it is not THAT much of a danger in the event of a crash. Whereas it IS very much a deeply annoying hazard in the event of accidentally starting a firmware update with the door closed...