That's physic???

[bongodriver]

Just to bring a little balance, not all of the physics demonstrated is flawed, obviously the missing rear fuselage is a bug.

[III/JG53_Don]

The devs are aware of this. They are working on the physics to avoid that such a plane condition is still flyable.
Eventhough the stories of pilots who came back with only half a wing are there, but this was the extreme exception. And therefore this should be reflected in the game.
Besides the photos above show that the planes still have most parts of the wing left contrary to the videos from 1st post.