This is a great post and I couldn't agree more. On top of the development cycle something else comes into play.

There are so many dynamics around mobile, especially on Android you need to understand. With Android, you really stand no chance to build a slick app, unless you have 600+ devices at hand where you can test the app.

With iPhone, it is very hard to track where your signups come from and content marketing on the web becomes a lot more difficult if you start with a mobile version. Directing traffic to a mobile only solution is never a very streamlined process for the user we found.