I don't remember healing in WoW being that fun. If there's an option to heal in a game, single player or not, I always heal. I did heal in WoW. But there's something about that game that I, personally, don't find engaging.

Only thing WoW has that I want in XIV is more obvious and engaging lore. But, that's not really on topic.

AST is very engaging to me. Because of the cards. I will say though, I do definitely wish that healers healed more often, as your main point is.