You do see more obvious safety duties being undertaken by cabin crew, like ensuring the aircraft doors are shut, locking toilets out-of-use for take-off/landing, ensuring all passengers are wearing seat belts, ensuring all luggage is safely stowed, ensuring all overhead luggage racks are properly shut, as well as doing a pre-flight safety demonstration and that's presuming there's no emergency and passengers aren't having to put on life jackets, oxygen masks or leaving the plane via the emergency exits on to the wing of the plane.