How many lives have been saved by refusing to board??? how many disasters averted by second guessing the filghtdeck????
Whilst I am aware the passengers are responsible for the boss being able to pay my wages, it is not always possible to inform the cabin of events as the workload increases expedientially if the problem is unusual or sudden.(misconfig, windshear, tcas, etc).
We try hard to be visual to the pax, often issuing relevant pa to assure and explain certain events but there is a limit in practical terms.
It is my job to fly the aircraft.....it is the pax job to allow us to do it in a competant and professional manner.