You don’t have to tell me about AOE3, I have played more hours there than in AOE2 and AOE4 combined 
Here I’m trying to explain that any unit is not unique, including the Great Bombard, and if one (Ottomans) add a unit, then then you need to do it for everyone else. If the Ottomans add an analogue of Mongud,
or Horse Archer, then it will have to be done with everyone, and for the Mongols and Rus add a unique unit, the Tsar Cannon, Gulyai-Gorod for Rus as an option.
pues en primer lugar que hiba a saber yo que jugabas aoe 3 xd aqui la mayoria ni siquiera le habia dado la oportunidad, y si entiendo tu punto por algo existen las unidades analogas, con sus cosas unicas y sus stats unicas pero que reemplazan el trabajo de una unidad generica