As stated in the comments, our apps are somewhat hybrid, just not to the extent most people mean when they use that term. The app uses customized
WebViews for displaying the actual contents of a question or answer.
We decided to make native applications because we wanted to make fast applications that took full advantage of the features the OS gave them. I've never seen a hybrid application that you couldn't quickly tell didn't "feel right", so it wasn't a very hard decision to make. Because we have native applications, we're in charge of every aspect of them without having to fight with some sort of middleman. We're also able to make our applications look exactly what we want them to look like, without having to write many different versions of CSS.