I think you will find that it is mostly the UK and US registered airlines and aircraft that have a complete ban. Most other authorities have differing levels of restriction. My company allows staff, and also friends or family, if acompanied by staff member, to jump seat travel. pax visits to the flight deck are only allowed on the ground, pre and post flight. all at captains discretion. (Major european carrier)
Most other countries can also even trust the crew with such things as a bottle of water!