On the topic of fighting shitposts, what I would love to see is a button that lets humans (with >= 500 earned merits) mark a post as "redundant":
I can think of plenty of users with >500 merit who would quite happily abuse this and brigade another user's posts to have them all hidden, especially in the case of trust disputes. Also, such a feature would undoubtedly be misunderstood and used for posts the user dislikes or disagrees with, not just posts which are redundant.
Now this is exactly the kind of thing you could use an AI for. They're neutral, don't get into trust disputes with anyone and never apply to join signature campaigns because they don't know what the hell that is.