[cdmwebs]

Because of the reasons in the post, but mainly our design team. I didn't want to set up a WordPress instance and make them learn the intricacies of php and WP theme system. They already understand the Rails folder structure, Sass, Haml and all the other tools we use.

tl;dr: it made collaboration easier.

[danaw]

I'm going to agree on your point as well. Designing with things like WordPress, Tumblr, etc become a major pain quickly. Especially considering the speed at which you can design with a bare rails app.