I'm not suggesting that Eastern Orthodox start using the Apostles' Creed. In fact the AC was never a part of the Eastern tradition. No problem. Same with the Rosary. I am reacting to your statement that it isn't Orthodox. In fact it is because it reflects the Orthodox Catholic Faith faithfully, regardless of its current use. If current use is a criterion for Orthodoxy, then there are lots of ancient Orthodox liturgical texts which became somehow un-Orthodox the moment they fell out of use (I have in mind the ancient rites of Antioch, Alexandria, Rome, Milan, etc.).