de Sade does spend a great amount of time expounding at length about philosophy and society in between the sex and torture, and if you took out the sex and torture, it looks a lot like a prediction (and criticism) of national syndicalism and fascism more than a century before those ideas became widespread. It's hard to look from 200 years later and see a prediction of something that happened 100 years ago as forward-thinking, but it was at the time.
I also think that his work has become more relevant today, not to the concept of the office, but to identity politics. But given the gratuitous imagery, esoteric style, and loss through translation, I'm not sure the benefit/cost ratio is high enough to warrant attention from an English-speaking reader.