During the pre flight brief I always remind the FO that the landing weight is not a consideration if we have a fire on board or an acute medical emergency.
87, you seem to have a strange grasp of the reality of flying an aeroplane. The pressurisation has nothing to do with an overweight landing or the rate of decent. You will find that reality will teach you that the books are for guidance. Nothing in them precludes the Captain from making any decision he feels will result in a safer outcome to any event he is confronted with.