I have heard of this before, but didn't read into it much.
I don't believe you are correct saying "much easier to reverse engineer than most binaries", you may get to the headers and paths etc. I know that the apps are protected by Apple's DRM system, which encrypts segments of the app (not the paths for example), and the keys are unique per device also.
Its possible using a jailbroken device to get the keys to decrypt the application - but jailbroken to me is non-existent as I see 0 point in it.
As with anything - nothing is impossible to reverse enginner (I know I had lots of fun with PPC). I do believe though that iOS apps are protected better than .NET (Windows), Java (Android), etc, don't you agree?