It only makes sense that, no matter how old the post, value should be retained somehow, without the need to re-post again and again.

I think Steemit needs a better interface to see older posts, just like YouTube does with its various category searches and sidebar feed of related videos (which also includes other recent unrelated searches and video views related to those).

The ability to add comments should also not be cut off after a set time period, and the more comments by a growing base of readers to any particular article should count toward the ranking of those articles, regardless how long ago they were posted.