This is mine too. Whenever I watch an old show I go back and read through the episode discussion threads from years ago. Sadly, I don't think this is something that can be replicated here apart from new releases. :(
I'd think that some subreddit (magazine) aggregator service would make it possible so it would make it easier to find all the most active communities on specific topic. Don't know if kbin or Lemmy is planning to do something similar that does actually work but it would be something.
This is a big one for me. Although, there were a few times where someone made an innocent prediction in one of these threads that ended up ruining a surprise for me later on. I’m choosing to view this as a small silver lining.