The issue with using any plug-in that achieves the admirable goal of making a WP installation highly customizable and less "template looking" is... if it stops getting supported, the site is screwed. Nobody wants to stop getting security updates to the core because the site depends on a plug-in. While many of us who work in the web industry realize "by the time it stops working, you probably need a new site anyway" a lot of our smaller clients still don't understand the web as an organic, evolving entity .