I think it depends on the permanence of the thing you’re keeping state for. For example for a blog post, you might want to keep it around for a long time.

But sometimes it’s less obvious how to keep state encoded in a URL or otherwise (i.e for the convenience of your users do you want refreshing a feed to return the user to a marker point in the feed that they were viewing? Or do you want to return to the latest point in the feed since users expect a refresh action to give them a fresh feed?).