It seems predetermined thread topics (I.e. officiating) floods the board as much as any other thread might. It essentially went unused, yet sat pinned. As a mobile user, it makes it one more thing to scroll through.
It's a good idea in theory. However, I've never minded multiple threads on a single topic, especially if their new discussions or are adding something original.
With the group chats, all dialogue and conversation becsmes mashed and buried into a single thread, making it difficult to get into the convo if you're jumping in late.