Why is iOS's sharing feature so limited or am I doing it wrong?

When trying to share an image on Android, you get a vast amount of options.

However, when you try to share an image on iOS 7, you only get a handful option apps. Why!?

I understand Apple has a different philosophy than Google and it may never get default apps option, but obviously they see some value in being able to share photos across different apps. They are long overdue. What is holding them back? Apple's philosophy? iOS's infrastructure? I doubt it's developer support.