That's fair. It's the kind of question those actually raiding it in progression would need to answer (like yourself, unlike me). What if 36 was a cap applied to all raiding in pre LDoN content?
LDoN raids are the most difficult I've ever played, in any game. Sure, the difficulty comes from the crushing tedium, endless waves of trash, and not accidentally targeting random boxes, but they're difficult all the same. Reducing the cap would only make it take longer. That'd be horrible.