One of the main requirements early on in this project was that the client wanted to be able to easily make changes to the site themselves.
A common complaint we hear is that the client is unhappy with having to go through an agency in order to make small minor changes to the site content. WordPress is often a CMS of choice because of the widespread ease-of-use as well as extensive documentation and how-to videos for anyone to easily pick up and understand how to make changes.