4 bolt flange that the pressed on bearing is bolted to that holds the axle in if you like.
merely that the axle shaft is retained by the bearing that is bolted to the axle housing. That being said, a broken shaft will not cause the wheel and tire to instantly slide out, that is what bearing failure will do, which brings us back full circle to my first statement that you deemed false.
Here you mentioned twice that the bearing is bolted on.
But maybe I misread what you meant. Regardless, we seem to agree that only the friction of the pressed on bearing on the axle shaft is holding the axle in the housing.
Having witnessed the effect, there is a FROR full-floater kit in my future.