The Forum features boards for each chapter! Generally the conversation is focused on the latest chapter, and yet as explained for previous ones if people would like to add their views/theories/observations and so forth, each one is organized so that may be done for each chapter at any point in time.
Whilst it keeps everything neat on the Forum, and helps people find what they are looking for, the different layout here on Discussions allows for people to create anything they like on the chapters. Multiple polls, images and posts on anything since that works best here. So may as well embrace everything that can be done, in the best places to do them!