A way to fight major bosses?

Do you guys think they'll ever release a way to fight some of the bigger bosses (Nameless Grandmaster, Ares, Gwenmaster, Kang, etc) without having to go through the required quests? Or no, because then people can practice them and trivialize the fights?

I was just thinking, because I'd love to fight Ares again, but I'm not exactly keen to redo a whole Epoch path just to fight him