[Ozzie_osman]

The main thing is the old forums were sorted by recency (how new a post was or how recently it was replied to) rather than some AI-driven engagement mechanism. They were structured (you'd have several rooms for different topics on the same forum).

[eleventen]

I'm not aware of any "AI-driven engagement mechanism" for subreddits. You can sort by new, top, hot, best. Hot/Best are opaque heuristics, but they function reasonably and you aren't forced to use them. And for most communities, tags function as adequate topic groupings.

You're rewarded for participation with fake nonsense points, same as all the forums of yore.

[grumbel]

Subreddit threads are sorted by time and ratings, old style forum threads are sorted by activity. You can't bump a thread on Reddit.

This leads to forums having threads that last years or decades, while on Reddit nothing lasts longer than a day or two. Points also didn't exist in old forums and even for those that have them now, they are more decorative than functional.

With a forum it's much easier to keep track of what you read, you can see the new threads easily and be done with them when you read them. With Reddit everything gets reshuffled all the time. Even sorting by "New" doesn't help, since that only takes the first post in a thread into account, and doesn't bump it when a new reply arrived.

All that said, I much prefer threaded discussion, a lot of forums become unreadable when they just put all posts into a linear feed.

[someonebaggy]

"best" and "hot" are opaque algorithmic feeds and the only way to see the currently active discussions. "new" shows you posts that have no discussions yet and "top" shows you ones whose discussions have concluded.

[karahime]

This probably isn't totally untrue, but, for example, 4chan is sorted by recency and has a lot of the same problems as other large sites online, which to me says that it can't just be complex recommendation systems driving problems.