Similarly, perhaps Paul was criticized for his dismissal of French Literature professors because a lot of people realized what a stupid blanket statement he made. Just because it's easier to bullshit about literature doesn't mean the whole of literature is bullshit. That's like assuming that just because math is about simplistic formulas, the entirety of math is simple to comprehend.
I don't know much about French literature, but what I do know of it tells me that by learning about it, I'd be learning not just about literary theory but about French sociology, French history, and the feelings behind France at various moments in times. There's an incredible amount of information in literature. It's not a bug that it's subjective in nature and prone to debate. That's the feature.