Long times really increase the value of the interesting posts and discussions. I do not see that on reddit or voat.

It would be nice to have certain subjects linked to certain subs. (holocaust anyone?), assuming these subs are not blocking the discussions with moderation.

Additional news could be added to the active discussions (I proposed link-replies for that). This could reset the age of the original post.

I see that in forums where we discuss a certain topic for a while. And then continue after a few weeks or even more, after new information has become available.
Long discussions and new information really bring value to the whole post.

Depending on the sub, the post can be valuable after many years. Posts with how-to-do-stuff, or with conclusive evidence, are far more valuable than someone's opinion about some tweet. This value is often the opposite of voting, due to emotional reactions.

This latter could be linked with a different vote? Voted keep-this by moderator maybe? Or collective safe-for-later vote?