Not the point. There are ways to make even an expected revelation have a strong impact, and ways to make it fall flat. The way we engage with fiction is by empathizing with the characters, putting ourselves in their place. It's not about what we know or expect, it's about what they know and how they learn and experience it. If we see them feeling something strongly, it helps us feel it strongly, even if we saw it coming. So establishing these things after the fact, through the reactions of characters who've had 5 months to get used to them, isn't as emotionally potent as putting us in the moment and letting us discover them along with the characters.
Storytelling is like magic. The audience knows the lady isn't really sawed in half, but if you sell the illusion well enough, they'll buy into it anyway and be suitably impressed. So it's not about what they know or expect, it's about what you can make them feel.