There's something that really frustrates me as a fan of any particular work of fiction, especially series: the inability to have meaningful conversations due to spoilers.
I'm in a room for fans of The Expanse on Matrix. Unfortunately it's almost exclusively populated with TV-only people (as opposed to book readers) and they're all over the map in terms of how much of the series they've watched. As a result, there is almost no worthwhile discussion of anything, other than people chiming in once in a while to say which episode they're on.
I get that people who haven't caught up with the show, or haven't read the books don't want stuff spoiled. I wouldn't in their position. Surely, there has to be a better way, though? I feel like in any general audience I can never talk about any work of fiction because there's always at least one person who isn't caught up. It's maddening.