The EA forum (and LessWrong) are both structured primarily as a newsfeed of posts sorted by date. This caters well to immediate engagement, but is much worse for building up a repository of knowledge which is accessible and relevant over a long time period. LessWrong 2.0 has (to some extent) managed to avoid this problem by having a) curated content, so that people don't have to look at literally everything which is posted, and b) sequences which store great posts in a format that makes them easily accessible a long time afterwards. The EA forum has neither. This makes it rather frustrating to try to use it to build on existing intellectual progress, as I recently found out while reviewing forum posts on career advice. Why don't we have any mechanisms for ensuring good content lasts, and what can be done about this? (Even just a blanket 'curate everything above x karma' strategy would help, while requiring very little moderator effort. EDIT: I actually no longer believe this last part, I think the key thing is collating material from across the internet.)
Another situation where it can be valuable for a post to spend more time on the frontpage: This essay argues it's important to have 4 layers of intellectual conversation. The number 4 seems arbitrary to me, but I agree with the overall point that back-and-forth is valuable and necessary. But if a post falls off the frontpage partway through that back-and-forth, people are less motivated to continue the back-and-forth because the audience is smaller.