I made a post about ArcHive about 2 weeks ago, I used it to archive the "Boar of Peace" Charter... but unlike ArcHive, archive.org allows you to see all that has been archived by others - This is the most important part that ArcHive hasn't developed yet.
If you look on your post, you will see hashtags, clicking those will take you to feeds that show what others are doing.
You're correct, I guess what i was think about is more of an ArcHive frontend, where a reg. person surfing the web can land on and browse/search through archives - similar to archive.org
Maybe at some point somebody will make a frontend that pulls the posts and presents them in a searchable format.