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Your observation about timing and the size of the bite is critical. With topic-heavy material like this there is a balance between giving people enough context to dive deep and breaking ideas into approachable pieces. Large macro sections can carry coherence but they also risk being intimidating or overlooked in a fast-moving feed. Smaller focused posts can generate sharper conversations but they can also lose the sense of overarching narrative unless carefully linked and curated.

The explore vs exploit tension on SN is worth highlighting. Once content falls off the front page it depends almost entirely on notifications to drive activity. That inherently favors momentary engagement over ongoing dialogue. If SN wants to support more evergreen discussions there may need to be more deliberate mechanisms to surface past threads when relevant to current conversations.

Your point about treasure in the comments is also important. For a book club or any deep discussion the richest insights are often buried there rather than in the OP. A platform that can find ways to extract, remix, or resurface those nuggets will allow discussions to have a second life and reach participants who missed them initially.