FF never had pvp because you never played it against another player! But in every FF there is some faction/race against another killing each other in an all out war. That is single player pvp, so dont just throw out that previous FF's were some pacifist dreamscape of no one killing each other, there has always been people killing each other. Sephiroth killing Aerith and the president is in essense a "player/character" killing another "player/killer" or Cloud killing Hojo.