Um... I don't exactly expect a fight with Jack Slash and crew. "How come Superman doesn't fight middle-school bullies?" Well, because there's a bit of a power and threat differential. Joe's challenges are not "How do I kill Hitler?" but rather "How do I undo all the evils that Hitler has caused over his lifespan, without actually rewinding time?" Order-of-magnitude doesn't begin to describe the difference in those two tasks.
Joe has long since passed into the realm of lesser godhood, in terms of the impact he can have on the world. His early fumblings included Lung, Weld, Panacea, and Bakuda. After a bit of leveling up and maturing, Joe has been much more deliberate and thoughtful in his interactions with Uppercrust and Gully, and those interactions have been much less like those of a mortal, random genius, or even parahuman miracle worker. Instead, he's been akin to a benevolent god or genie, or a random visitor from the Q continuum. Hop over to a Star Trek forum and ask, "Why doesn't Q get into fist fights with Wesley?"
I do look forward to some epic scenes in the S9 fight chapter, but I expect they will be on the order of "This beetle represents the S9. This speeding car represents Joe. Now let's watch the windshield fight that's about to occur."
