I never misunderstood the quote but I assumed it was posted in relevance to the thread, where we're talking about fiction...
Well, War and Peace is a fictionalized account of a French and Russian conflict. So that's still fiction.
I agree with Steerpike. Just because certain comic book writers can't pull off good vs. good doesn't mean it's not a feasible type of conflict. Writers can do wonders with just about any kind of conflict if they're good writers.