WordPress provides extensive functionality right out-of-the-box and often little customization is needed to adapt the software for your unique use. Many other CMSs rely on you to hunt down, install, and configure a long-list of add-ons just to get many of the features WordPress considers core (comments, RSS feeds, revisions, etc.) and relies on developers to undertake significant coding efforts to provide the functionality you need. WordPress does the heavy lifting so you don’t have to. Why reinvent the wheel when you already have the best wheel in the world?