I'm not sure that's true. I think there are some fairly popular mobile apps using a webview. The facebook app? Honestly I don't know if that's true but their mobile website has almost the exact same UX. There's a few subtle differences but maybe those come from some glue around a webview and not all brand new code.
They sacrifice UX doing so.
> Development is often much faster that way ...
It's faster for their existing web team, which is what this is really about.