Are we allowed to tell other people why?
Then what is the problem??
As someone done Dropbox integration for many of my clients, I know how easy it is to implement app folders.
I know it and you know it. We all know what kind of game agilebit is playing here.
They addressed the ease of implementation, and have a valid point - it breaks backwards compatibility. That is something I do know about, and it's a terrible thing to do. Yes, they could write a migration path. Yes, they could write all the documentation in the world to go with the migration path. But, yes, it will cause their existing customers - who aren't complaining, save a handful - pain, since the app will stop working as expected, even if only briefly. And that still doesn't address the fact that AgileBits gets to make the app they want to make, and we have the choice to use it or not.
The ease of implementation was never their rationale not to, and even was acknowledged in the thread. And my primary point was that they're only accountable to users as far as they can keep them, and have the freedom to make the application they want.
Keep in mind that, since dropbox did not have app folder concept initially, many companies used to have access to entire dropbox then moved to app folder model later. they did not break backward compatibility and they didn't make the excuses.