Even if the electronics failed, leaving the driver stuck inside, you would think the owners would have the foresight to either have something capable of breaking windows or a method by which to break them.
In an EV your fuel and ignition sources are fundamentally inseparable and you can gain a lot (range/capacity, charge time/peak power) by being unsafe with it (running the battery to the ragged edge of what it can tolerate).
The fact that in response they quickly rolled out an update that neutered a large amount of capacity is far more interesting than the fires themselves and probably what the NHTSA wants to look into.
It is pretty clear though, Tesla has expensive new cars you need to compare them with similar cars.
Also, lithium cells just need to be punctured to catch fire, they don't need an external ignition source.
I was in a significant crash when I was 10 years old, and had to kick the opposite-side rear door to get me and my younger sibling out of the burning vehicle. The latch still worked, but the body panel was heavily dented by the collision.
And the only car I had in my live that has something to break a car window from the inside is my 4x4. And that only because the previous owner used it extensively for off-roading. So quite the opposite from your average Tesla.
Just for clarification, all Tesla vehicles, Model X included, have a manual pull to open the door even in the case that the power is dead. https://www.youtube.com/watch?v=01lXcD_Uz74
Basic design should mean that familiar methods work in an emergency. People often follow the usual way out of a building, even if there's a closer fire exit.
I just wrote above, but I was trapped in a burning car when I was a kid. The door latch worked, but I had to hold it open and kick the door to unjam it after a collision.
Had it been a Tesla, would I have known about unclipping the speaker grill, or finding a small tag to pull on at night? And been able to kick the door at the same time?