What's the point of that community? Both it's current and new /c/ lack any explanation of what they are about in their sidebar. By scrolling through I can't get the central idea behind it, what it actually represents or what exactly it focuses on.

Can anyone help me with that? Can mods update it? Is it by design?

The lack of focus, if it's shared by mods and users alike, could've been one of the reasons it's now inactive.