Fediverse

This is more of a front end thing. Mastodon sometimes revives old content by people boosting an old post that could go viral again. Lemmy's algo is designed around hiding older posts as they age. I could see this being more relevant in upcoming software like Discourse and phpbb which are adding fedi support. They're more traditional old-school forum software and I think that revives older content better, as one user commenting on an old post will bring up a thread to the top again.

I often find I can't see old posts in active communities, and on masto my instance only holds 2w worth of cache because the owner is but one man not a corpo with endless storage.

Doubt it as they will get buried anyways. Forums should be more common and even they autolock threads. At some point in time you have to reframe the content into the current cultural context.

Some content does get locked but usually it's when the comments go off the rails, so it's pretty rare

I've had it from time to time

my latest notification was that