MissM
Concerning your door problem.
Like many of your colleagues you are making the mistake of believing that as cabin crew you are entitled to dictate policy as to what is safe and what is not safe.
Your job is to do as you are told and not query what aircraft manufacturers and airlines decide is safe. Company policy on safety matters changes continually depending on various things like experience, manufacturer's guidelines and other operators incidents.
Many contributors on this thread display a lack of company loyalty but attempt to camouflage it by claiming it is about safety when it is more about pursuing their own self interest. Fewer cabin crew on the aircraft means more work and less promotional prospects.