The fuck do you expect Special Forces and Black Dragon to do, try to kung fu everyone? That works in a tournament like MK1 and MK2. MK11 is not a tournament.
Yeah it's a fighting game and yeah NRS has to make up a way to make everything come down to a 1v1 battle in the end, but on the way there they have to at least PRETEND that the story makes sense. And that means when you see an army of thousands of demons coming your way, you shoot the fucking shit out of them.
Johnny carries a handgun with him in his default skin, but does he use it when he's dropping fools 1v1? No. It's a measure of last resort. It's visual storytelling. "This is how dangerous the MK world is, that even Johnny has to have a gun on him just in case."