Easy migration to the Xamarin Platform.
When your native platform integration requirements outgrow Xamarin.Forms, your shared code is easily migrated to Xamarin.iOS and Xamarin.Android using the full Xamarin platform.
In the advertisment it is stated that it is easy to migrate. Currently I don't see how ... Perhaps you can take part of the business logic, but otherwise?
I also read here that
Xamarin.Forms code and custom controls can also be used in Xamarin.iOS, Xamarin.Android, and Windows Phone apps
How?