If I recall correctly, ten years ago I heard a Boeing salesman say that the B777 had doors that would be more easily ripped off than any other Boeing produced at that time... without putting the safety at risk of course.
I think the idea was to have a "clean cut" in case of trouble with the stairs, bridge, finger, etc. If the door is damaged anyway, let's trash it properly and rip it off: in the end it'll make the fixing job easier.