Steven Aquino, writing at Tech.pinions:

The reality is that, as a nerd, I get by fine with Dropbox. However, just because one solution works for me doesn’t mean Dropbox is the answer, or that iOS and iCloud are above improvement. On the contrary, this piece (hopefully) illustrates that iOS and iCloud can be much better at certain things, like document management.

This topic isn’t new, but it’s still relevant because Apple’s implementation is anachronistic and strange considering other advancements in iOS. There’s a glimmer of hope in iPhoto for iOS 7, but nothing more. Open In is not the solution.