If you are a Rails developer, this Turbolinks presentation makes a strong case to be used for mobile apps. https://m.youtube.com/watch?v=SWEts0rlezA

It seems like there is a strong productivity gain from using rails here since it’s extremely productive and you can make simple wrapper apps to release to the Play and App Store that really just wrap the web view.

The biggest gain is obviously reusing most of the web app across three different platforms, and the ability to add native navigation and interaction as needed, later. You also avoid needing a big javascript library.